What is a 25-digit number?

A 25-digit number is a number that has 25 digits where the first digit must be 1 or greater. On this page, we will answer three questions for you: What is the smallest 25-digit number? What is the largest 25-digit number? How many 25-digit numbers are there?

Smallest 25-digit number
The smallest 25-digit number is 1 followed by 24 zeros. This number is called one septillion.

Largest 25-digit number
The largest 25-digit number is 9 followed by another 24 nines. This number is called 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 25-digit numbers
There are a total of nine septillion different 25-digit numbers. nine septillion is 9 followed by 24 zeros.

Digit Numbers
Here you can learn about another digit number.

What is a 26-digit number?
Go here for information about the next digit number on our list that we have information about.