Fatto generale: 16566 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 16566 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 16566 is an unremarkable number.
Data storica: May 9th is the day in 1877 that a magnitude 8.8 earthquake off the coast of Peru kills 2,541, including some as far away as Hawaii and Japan.