# Number Gossip

(Enter a number and I'll tell you everything you wanted to know about it but were afraid to ask.)

## Unique Properties of 645

- 645 is the smallest Smith number which is also a pseudoprime base 2
- 645 is the largest 3-digit pseudoprime to base 2
- 645 is the smallest Fermat pseudoprime to base 2 which are not an Euler pseudoprime to base 2