Hecho general: 66373 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 66373 is an unremarkable number.
Trivia: 66373 is a boring number.
Fecha histórica: September 20th is the day in 1881 that Chester A. Arthur is inaugurated as the 21st President of the United States following the assassination of James Garfield.