What is a 99-digit number?

A 99-digit number is a number that has 99 digits where the first digit must be 1 or greater. On this page, we will answer three questions for you: What is the smallest 99-digit number? What is the largest 99-digit number? How many 99-digit numbers are there?

Smallest 99-digit number
The smallest 99-digit number is 1 followed by 98 zeros. This number is called one hundred untrigintillion.

Largest 99-digit number
The largest 99-digit number is 9 followed by another 98 nines. This number is called nine hundred ninety-nine untrigintillion nine hundred ninety-nine trigintillion nine hundred ninety-nine novemvigintillion nine hundred ninety-nine octovigintillion nine hundred ninety-nine septenvigintillion nine hundred ninety-nine sexvigintillion nine hundred ninety-nine quinvigintillion nine hundred ninety-nine quattuorvigintillion nine hundred ninety-nine trevigintillion nine hundred ninety-nine duovigintillion nine hundred ninety-nine unvigintillion nine hundred ninety-nine vigintillion nine hundred ninety-nine novemdecillion nine hundred ninety-nine octodecillion nine hundred ninety-nine septendecillion nine hundred ninety-nine sexdecillion nine hundred ninety-nine quindecillion nine hundred ninety-nine quattuordecillion nine hundred ninety-nine tredecillion nine hundred ninety-nine duodecillion nine hundred ninety-nine undecillion nine hundred ninety-nine decillion nine hundred ninety-nine nonillion nine hundred ninety-nine octillion nine hundred ninety-nine septillion nine hundred ninety-nine sextillion nine hundred ninety-nine quintillion nine hundred ninety-nine quadrillion nine hundred ninety-nine trillion nine hundred ninety-nine billion nine hundred ninety-nine million nine hundred ninety-nine thousand nine hundred ninety-nine.

Total number of 99-digit numbers
There are a total of nine hundred untrigintillion different 99-digit numbers. nine hundred untrigintillion is 9 followed by 98 zeros.

Digit Numbers
Here you can learn about another digit number.

What is a 100-digit number?
Go here for information about the next digit number on our list that we have information about.