A 64-digit number is a number that has 64 digits where the first digit must be 1 or greater. On this page, we will answer three questions for you: What is the smallest 64-digit number? What is the largest 64-digit number? How many 64-digit numbers are there?

**Smallest 64-digit number**

The smallest 64-digit number is 1 followed by 63 zeros. This number is called one vigintillion.

**Largest 64-digit number**

The largest 64-digit number is 9 followed by another 63 nines. This number is called 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 64-digit numbers**

There are a total of nine vigintillion different 64-digit numbers. nine vigintillion is 9 followed by 63 zeros.

**Digit Numbers**

Here you can learn about another digit number.

**What is a 65-digit number?**

Go here for information about the next digit number on our list that we have information about.

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