Fatto generale: 17664 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 17664 is an uninteresting number.
Trivia: 17664 is an unremarkable number.
Data storica: May 11th is the day in 1967 that Andreas Papandreou, Greek economist and socialist politician, is imprisoned in Athens by the Greek military junta.