Fatto generale: 61646 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 61646 is an unremarkable number.
Trivia: 61646 is an unremarkable number.
Data storica: October 11th is the day in 1614 that Adriaen Block and 12 Amsterdam merchants petition the States General for exclusive trading rights in the New Netherland colony.