general_fact: 55770 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 55770 is an uninteresting number.
trivia: 55770 is an unremarkable number.
historical_date: September 9th is the day in 1379 that Treaty of Neuberg, splitting the Austrian Habsburg lands between the Habsburg Dukes Albert III and Leopold III.