Fait mathématique: 6466 is the largest known value of n for which the n^{th} prime begins with the digits of n.
Culture générale: 6466 is an unremarkable number.
Date historique: September 13th is the day in 533 that General Belisarius of the Byzantine Empire defeats Gelimer and the Vandals at the Battle of Ad Decimium, near Carthage, North Africa.