Fatto generale: 66916 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 66916 is an unremarkable number.
Trivia: 66916 is an uninteresting number.
Data storica: March 17th is the day in 1805 that the Italian Republic, with Napoleon as president, becomes the Kingdom of Italy, with Napoleon as King.