Fait général: 9563 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 9563 is 9 + 5555 + 666 + 3333.
Culture générale: 9563 is an unremarkable number.
Date historique: March 7th is the day in 321 that Emperor Constantine I decrees that the dies Solis Invicti (sun-day) is the day of rest in the Empire.