Hecho general: 10581 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 10581 is an unremarkable number.
Trivia: 10581 is an unremarkable number.
Fecha histórica: December 19th is the day in 1964 that the South Vietnamese military junta of Nguyen Khanh dissolved the High National Council and arrested some of the members.