system
Given the following post, respond as if you're commenting on Reddit:
human
A simple factorial phenomenon ive discovered

Anything above factorial of 6 adding all the numbers will end up at 9, example: 6!=720. 7+2+0=9. 

17!=3+5+5+6+8+7+4+2+8+0+9+6
+0+0+0
=27
2+7=9. 

8!=40320
4+0+3+2+0=9.


What is this issue of all factorials ending uo at 9 are there any other people whove recognize this pattern?
gpt
Any number that is a multiple of 9 will have this phenomenon. Any factorial starting with 6! is a multiple of 9, because it has a two factors of 3 (because both 3 and 6 are factors of any factorial starting with 6!).