Fatto generale: 72661 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 72661 is an uninteresting number.
Trivia: 72661 is an unremarkable number.
Data storica: December 9th is the day in 1979 that the eradication of the smallpox virus is certified, making smallpox the first and to date only human disease driven to extinction.