Factorial/Examples/13

Example of Factorial

 * $13! = 6 \, 227 \, 020 \, 800$

Proof
From $12$ factorial:
 * $12! = 479 \, 001 \, 600$

Then: 479 001 600 x         13 - 1 437 004 800 4 790 016 000 - 6 227 020 800