general_fact: 66413 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 66413 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 66413 is an uninteresting number.
historical_date: October 30th is the day in 1938 that Orson Welles broadcasts his radio play of H. G. Wells's The War of the Worlds, causing anxiety in some of the audience in the United States.