Fait général: 56613 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 56613 is an uninteresting number.
Culture générale: 56613 is an unremarkable number.
Date historique: December 31st is the day in 535 that Byzantine General Belisarius completes the conquest of Sicily, defeating the Ostrogothic garrison of Syracuse, and ending his consulship for the year.