A 63-digit number is a number that has 63 digits where the first digit must be 1 or greater. On this page, we will answer three questions for you: What is the smallest 63-digit number? What is the largest 63-digit number? How many 63-digit numbers are there?

**Smallest 63-digit number**

The smallest 63-digit number is 1 followed by 62 zeros. This number is called one hundred novemdecillion.

**Largest 63-digit number**

The largest 63-digit number is 9 followed by another 62 nines. This number is called 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 63-digit numbers**

There are a total of nine hundred novemdecillion different 63-digit numbers. nine hundred novemdecillion is 9 followed by 62 zeros.

**Digit Numbers**

Here you can learn about another digit number.

**What is a 64-digit number?**

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

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