What is a 15-digit number?

A 15-digit number is a number that has 15 digits where the first digit must be 1 or greater. On this page, we will answer three questions for you: What is the smallest 15-digit number? What is the largest 15-digit number? How many 15-digit numbers are there?

Smallest 15-digit number
The smallest 15-digit number is 1 followed by 14 zeros. This number is called one hundred trillion.

Largest 15-digit number
The largest 15-digit number is 9 followed by another 14 nines. This number is called 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 15-digit numbers
There are a total of nine hundred trillion different 15-digit numbers. nine hundred trillion is 9 followed by 14 zeros.

Digit Numbers
Here you can learn about another digit number.

What is a 16-digit number?
Go here for information about the next digit number on our list that we have information about.