Fatto generale: 363 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 363 is a perfect totient number.
Trivia: 363 is an uninteresting number.
Data storica: December 28th is the day in 1956 that Chin Peng, David Marshall and Tunku Abdul Rahman meet in Baling to try and resolve the Malayan Emergency situation.