Fatto matematico: 16624 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 16624 is a boring number.
Data storica: July 6th is the day in 1936 that a major breach of the Manchester, Bolton and Bury Canal in England sends millions of gallons of water cascading 200 feet (61 m) into the River Irwell.