Fatto generale: 15683 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 15683 is a boring number.
Trivia: 15683 is an uninteresting number.
Data storica: December 8th is the day in 1991 that the leaders of Russia, Belarus and Ukraine sign an agreement dissolving the Soviet Union and establishing the Commonwealth of Independent States.