Fatto generale: 11643 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 11643 is an unremarkable number.
Trivia: 11643 is an uninteresting number.
Data storica: November 16th is the day in 1907 that Cunard Line's RMS Mauretania, sister ship of RMS Lusitania, sets sail on her maiden voyage from Liverpool, England to New York City.