Fatto generale: 63537 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 63537 is an uninteresting number.
Trivia: 63537 is a boring number.
Data storica: December 15th is the day in 1997 that a chartered Tupolev TU-154 from Tajikistan crashes in the desert near Sharja, United Arab Emirates airport killing 85.