Fatto generale: 64633 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 64633 is an unremarkable number.
Trivia: 64633 is an unremarkable number.
Data storica: December 15th is the day in 1942 that the Battle of Mount Austen, the Galloping Horse, and the Sea Horse begins during the Guadalcanal campaign.