general_fact: 15916 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 15916 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 15916 is an unremarkable number.
historical_date: July 29th is the day in 1993 that the Israeli Supreme Court acquits alleged Nazi death camp guard John Demjanjuk of all charges and he is set free.