Fatto generale: 16257 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 16257 is an unremarkable number.
Trivia: 16257 is an unremarkable number.
Data storica: July 4th is the day in 1610 that the Battle of Klushino between forces of the Polish–Lithuanian Commonwealth and Russia during the Polish-Muscovite War.