how many zeroes are there in an octillion?
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Have ever wondered how many zeroes are in a million? A billion? A trillion? Do you know how many zeros there are in a vigintillion? Someday you may need to know this for science or math class. Then again, you might just want to impress a friend or teacher.
Numbers Bigger Than a Trillion
The digit zero plays an important role as you count very large numbers. It helps track these multiples of 10 because the larger the number is, the more zeroes are needed. In the table below, the first column lists the name of the number, the second provides the number of zeros that follow the initial digit, and the third tells you how many groups of three zeros you would need to write out each number.
Name  Number of Zeros  Groups of (3) Zeros 

Ten  1  (10) 
Hundred  2  (100) 
Thousand  3  1 (1,000) 
Ten thousand  4  (10,000) 
Hundred thousand  5  (100,000) 
Million  6  2 (1,000,000) 
Billion  9  3 (1,000,000,000) 
Trillion  12  4 (1,000,000,000,000) 
Quadrillion  15  5 
Quintillion  18  6 
Sextillion  21  7 
Septillion  24  8 
Octillion  27  9 
Nonillion  30  10 
Decillion  33  11 
Undecillion  36  12 
Duodecillion  39  13 
Tredecillion  42  14 
Quatttuordecillion  45  15 
Quindecillion  48  16 
Sexdecillion  51  17 
Septendecillion  54  18 
Octodecillion  57  19 
Novemdecillion  60  20 
Vigintillion  63  21 
Centillion  303  101 
All of Those Zeroes
A table like the one above can certainly be helpful in listing the names of all of the numbers depending on how many zeros they have. But it can be really mindboggling to see just what some of those numbers look like. Below is a listing—including all the zeros—for the numbers up to decillion—a little more than just half the numbers listed in the above table.
Ten: 10 (1 zero)
Hundred: 100 (2 zeros)
Thousand: 1000 (3 zeros)
Ten thousand 10,000 (4 zeros)
Hundred thousand 100,000 (5 zeros)
Million 1,000,000 (6 zeros)
Billion 1,000,000,000 (9 zeros)
Trillion 1,000,000,000,000 (12 zeros)
Quadrillion 1,000,000,000,000,000 (15 zeros)
Quintillion 1,000,000,000,000,000,000 (18 zeros)
Sextillion 1,000,000,000,000,000,000,000 (21 zeros)
Septillion 1,000,000,000,000,000,000,000,000 (24 zeros)
Octillion 1,000,000,000,000,000,000,000,000,000 (27 zeros)
Nonillion 1,000,000,000,000,000,000,000,000,000,000 (30 zeros)
Decillion 1,000,000,000,000,000,000,000,000,000,000,000 (33 zeros)
Zeros Grouped in Sets of 3
Reference to sets of zeros is reserved for groupings of three zeros, meaning they are not relevant for smaller numbers. We write numbers with commas separating sets of three zeros so that it’s easier to read and understand the value. For example, you write one million as 1,000,000 rather than 1000000.
As another example, it’s much easier to remember that a trillion is written with four sets of three zeros than it is to count out 12 separate zeroes. While you might think that that one is pretty simple, just wait until you have to count 27 zeros for an octillion or 303 zeros for a centillion.
It is then that you will be thankful that you only have to remember nine and 101 sets of zeros, respectively.
Numbers With Very Large Numbers of Zeros
The number googol , has 100 zeros after it. Here’s what a googol looks like, including all of its required zeros:
10,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000
Do you think that number is big? How about the googolplex, which is a one followed by a googol of zeros. The googolplex is so large it doesn’t have any meaningful use yet—it is larger than the number of atoms in the universe.
Million and Billion: Some Differences
In the United States—as well as around the world in science and finance—a billion is 1,000 million, which is written as a one followed by nine zeros. This is also called the “short scale.”
There is also a “long scale,” which is used in France and was previously used in the United Kingdom, in which a billion means one million million. According to this definition of a billion, the number is written with a one followed by 12 zeros. The short scale and long scale were described by French mathematician Genevieve Guitel in 1975.
Hierarchy of Decimal Numbers
Number

Name

How many

0  zero  
1  one 
.

2  two  .. 
3  three  … 
4  four  …. 
5  five  ….. 
6  six  …… 
7  seven  ……. 
8  eight  …….. 
9  nine  ……… 
10  ten  ……… 
20  twenty  two tens 
30  thirty  three tens 
40  forty  four tens 
50  fifty  five tens 
60  sixty  six tens 
70  seventy  seven tens 
80  eighty  eight tens 
90  ninety  nine tens 
Number  Name  How Many 
100  one hundred  ten tens 
1,000  one thousand  ten hundreds 
10,000  ten thousand  ten thousands 
100,000  one hundred thousand  one hundred thousands 
1,000,000  one million  one thousand thousands 
Some people use a comma to mark every 3 digits. It just keeps track of the digits and makes the numbers easier to read.
Beyond a million, the names of the numbers differ depending where you live, and also the context. The places are grouped by thousands in countries using the “short scale” (such as the United States, Australia and Englishspeaking Canada), and by the millions in countries using the “long scale” (such as France and Germany). For further details on usage by country, see this article.
Name  Short scale  Long scale 
million  1,000,000  1,000,000 
billion  1,000,000,000 (a thousand millions)  1,000,000,000,000 (a million millions) 
trillion  1 with 12 zeros  1 with 18 zeros 
quadrillion  1 with 15 zeros  1 with 24 zeros 
quintillion  1 with 18 zeros  1 with 30 zeros 
sextillion  1 with 21 zeros  1 with 36 zeros 
septillion  1 with 24 zeros  1 with 42 zeros 
octillion  1 with 27 zeros  1 with 48 zeros 
googol 
1 with 100 zeros


googolplex 
1 with a googol of zeros

Digits to the right of the decimal point represent the fractional part of the decimal number. Each place value has a value that is one tenth the value to the immediate left of it.
Number  Name  Fraction 
.1  tenth  1/10 
.01  hundredth  1/100 
.001  thousandth  1/1000 
.0001  ten thousandth  1/10000 
.00001  hundred thousandth  1/100000 
Examples:
0.234 = 234/1000 (said – point 2 3 4, or 234 thousandths, or two hundred thirty four thousandths)
4.83 = 4 83/100 (said – 4 point 8 3, or 4 and 83 hundredths)


I=1  (I with a bar is not used)  
V=5  _ V=5,000 

X=10  _ X=10,000 

L=50  _ L=50,000 

C=100  _ C = 100 000 

D=500  _ D=500,000 

M=1,000  _ M=1,000,000 
Roman Numeral Calculator
Examples:
1 = I 2 = II 3 = III 4 = IV 5 = V 6 = VI 7 = VII 8 = VIII 9 = IX 10 = X 
11 = XI 12 = XII 13 = XIII 14 = XIV 15 = XV 16 = XVI 17 = XVII 18 = XVIII 19 = XIX 20 = XX 21 = XXI 
25 = XXV 30 = XXX 40 = XL 49 = XLIX 50 = L 51 = LI 60 = LX 70 = LXX 80 = LXXX 90 = XC 99 = XCIX 
There is no zero in the roman numeral system.
The numbers are built starting from the largest number on the left, and adding smaller numbers to the right. All the numerals are then added together.
The exception is the subtracted numerals, if a numeral is before a larger numeral, you subtract the first numeral from the second. That is, IX is 10 – 1= 9.
This only works for one small numeral before one larger numeral – for example, IIX is not 8, it is not a recognized roman numeral.
There is no place value in this system – the number III is 3, not 111.
Number Base Systems
Decimal(10)

Binary(2)

Ternary(3)

Octal(8)

Hexadecimal(16)

0 
0

0

0 
0 
1

1

1

1

1

2

10

2

2

2

3

11

10

3

3

4

100

11

4

4

5

101

12

5

5

6

110

20

6

6

7

111

21

7

7

8

1000

22

10

8

9

1001

100

11

9

10

1010

101

12

A

11

1011

102

13

B

12

1100

110

14

C

13

1101

111

15

D

14

1110

112

16

E

15

1111

120

17

F

16

10000

121

20

10

17

10001

122

21

11

18

10010

200

22

12

19

10011

201

23

13

20

10100

202

24

14

Each digit can only count up to the value of one less than the base. In hexadecimal, the letters A – F are used to represent the digits 10 – 15, so they would only use one character.