general_fact: 19668 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 19668 is an unremarkable number.
trivia: 19668 is a boring number.
historical_date: November 5th is the day in 1916 that the Kingdom of Poland is proclaimed by the Act of November 5th of the emperors of Germany and Austria-Hungary.