Fatto generale: 4156 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 4156 is 4^{5} + 1^{5} + 5^{5} + 6.
Trivia: 4156 is a boring number.
Data storica: May 18th is the day in 1268 that the Principality of Antioch, a crusader state, falls to the Mamluk Sultan Baibars in the Battle of Antioch.