Fatto generale: 15563 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 15563 is an uninteresting number.
Trivia: 15563 is a boring number.
Data storica: August 10th is the day in 2006 that Scotland Yard disrupts a major terrorist plot to destroy aircraft traveling from the United Kingdom to the United States.