Hecho matemático: 1563 is the smallest number with the property that its first 4 multiples contain the digit 6.
Trivia: 1563 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fecha histórica: April 11th is the day in 1981 that a massive riot in Brixton, South London, results in almost 300 police injuries and 65 serious civilian injuries.