Fait mathématique: 2466 is the number of regions formed when all diagonals are drawn in a regular 18-gon.
Culture générale: 2466 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: October 1st is the day in 1189 that Gerard de Ridefort, grandmaster of the Knights Templar since 1184, is killed in the Siege of Acre.