What is 100! (100 Factorial)?
100 factorial is an astronomically large number with 158 digits, far exceeding the number of atoms in the observable universe.
How to use this tool
- Enter n in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your n! and the full breakdown beneath it.
100! is a famous large number in mathematics — it has 158 digits and is used in many combinatorics proofs.
Frequently asked questions
- What is a factorial?
- The factorial of n (written n!) is the product of all positive integers up to n. By definition, 0! = 1.