Hecho general: 5616 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 5616 is the order of a non-cyclic simple group.
Trivia: 5616 is a boring number.
Fecha histórica: May 17th is the day in 1865 that the International Telegraph Union (later the International Telecommunication Union) is established in Paris.