What is a 40-digit number?

A 40-digit number is a number that has 40 digits where the first digit must be 1 or greater. On this page, we will answer three questions for you: What is the smallest 40-digit number? What is the largest 40-digit number? How many 40-digit numbers are there?

Smallest 40-digit number
The smallest 40-digit number is 1 followed by 39 zeros. This number is called one duodecillion.

Largest 40-digit number
The largest 40-digit number is 9 followed by another 39 nines. This number is called 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 40-digit numbers
There are a total of nine duodecillion different 40-digit numbers. nine duodecillion is 9 followed by 39 zeros.

Digit Numbers
Here you can learn about another digit number.

What is a 41-digit number?
Go here for information about the next digit number on our list that we have information about.