Fait général: 6568 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 6568 is a boring number.
Culture générale: 6568 is an uninteresting number.
Date historique: December 24th is the day in 1818 that the first performance of "Silent Night" takes place in the church of St. Nikolaus in Oberndorf, Austria.