Fait général: 6475 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 6475 is a value of n for which p(n) is the product of the digits of n.
Culture générale: 6475 is a boring number.
Date historique: September 22nd is the day in 1761 that George III and Charlotte of Mecklenburg-Strelitz are crowned King and Queen, respectively, of the Kingdom of Great Britain.