Hecho general: 61665 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 61665 is an unremarkable number.
Trivia: 61665 is an unremarkable number.
Fecha histórica: October 30th is the day in 1960 that Michael Woodruff performs the first successful kidney transplant in the United Kingdom at the Edinburgh Royal Infirmary.