Hecho general: 66001 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 66001 is an unremarkable number.
Trivia: 66001 is an uninteresting number.
Fecha histórica: September 13th is the day in 1979 that South Africa grants independence to the "homeland" of Venda (not recognised outside South Africa).