Fatto generale: 663 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 663 is the generalized Catalan number C(15,3).
Trivia: 663 is an unremarkable number.
Data storica: October 24th is the day in 2005 that Hurricane Wilma makes landfall in Florida resulting in 35 direct 26 indirect fatalities and causing $20.6B USD in damage.