How Many Zeros in an Octodecillion?
By Vinitha Published Updated
How many zeros in an octodecillion? An octodecillion has 57 zeros in the short-scale system: 1057. The prefix octo- means eight and dec- means ten — together the 18th position, since octodecim is Latin for eighteen. Questions about the digit 1 followed by 27 zeros are answered in how many zeros in an octillion.
An octodecillion has
57
zeros
- Written Form
- 1 followed by 57 zeros
- Scientific
- 10⁵⁷
Verifying Octodecillion's Zero Count
The direct answer: exactly 57 zeros — 19 groups of three zeros after the leading 1, since 3 × 19 = 57. To see comma-grouped digits in a nineteen-digit number and scientific notation for very large counts, read quintillion zeros.
Octodecillion Written Out
Written out in full using standard US comma notation, one octodecillion is the digit 1 followed by 57 zeros: 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 — 58 digits in total.
- Comes after
- Septendecillion —
1054 - Comes before
- Novemdecillion —
1060
Octodecillion vs Its Neighbors
| Name | Zeros | Scientific notation |
|---|---|---|
| Septendecillion | 54 | 1054 |
| Octodecillion | 57 | 1057 |
| Novemdecillion | 60 | 1060 |
How Many Zeros in 1,000 Octodecillion?
- 1 octodecillion =
1057— 57 zeros - 10 octodecillion =
1058— 58 zeros - 1,000 octodecillion =
1060— 60 zeros (= one novemdecillion)
In the British long-scale system, octodecillion instead means
10108— 108 zeros, nearly double the short-scale exponent. How many zeros in a trillion also looks at twelve zeros after the leading 1.
Watch: How Many Zeros in an Octodecillion?
How many zeros in an octodecillion? An octodecillion has 57 zeros — 1 followed by 57 zeros. Watch this short video for the zero count, the written form and the notation at a glance.
Zeros in an Octodecillion: FAQ
What comes before an octodecillion?
Quick answer
Hundred septendecillion comes right before an octodecillion.
What comes after an octodecillion?
Quick answer
Ten octodecillion comes next, followed by hundred octodecillion and then novemdecillion.
How many digits does an octodecillion have?
An octodecillion has 58 digits in total — that's the digit 1 followed by 57 zeros.
How many zeros in 2 octodecillion? In half an octodecillion?
Two octodecillion keeps the same 57 zeros. Half an octodecillion has 56 trailing zeros after the 5.
Is a 57-digit number always an octodecillion?
No. A 57-digit number tops out at hundreds of septendecillions — an octodecillion is the first 58-digit number.
How many zeros in an octodecillion in the British system?
Under the old long-scale system, an octodecillion meant 10108 — 51 more zeros than today's short-scale octodecillion.
About the Author
Designer and Developer · Palakkad, Kerala, India
Vinitha holds a bachelor's degree in Textile and Apparel Design from Avinashilingam University, plus a C-Tech certificate in Graphic Design from Image Creative Education. She builds free, no-clutter reference tools like How Many Zeros. Read her full bio.