Fait général: 18564 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 18564 is a boring number.
Culture générale: 18564 is an unremarkable number.
Date historique: October 28th is the day in 1628 that the Siege of La Rochelle, which had lasted for 14 months, ends with the surrender of the Huguenots.