Fait général: 6463 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 6463 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 6463 is a boring number.
Date historique: September 10th is the day in 1976 that a British Airways Hawker Siddeley Trident and an Inex-Adria DC-9 collide near Zagreb, Yugoslavia, killing 176.