general_fact: 6619 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 6619 is an unremarkable number.
trivia: 6619 is an unremarkable number.
historical_date: February 13th is the day in 1881 that the feminist newspaper La Citoyenne is first published in Paris by the activist Hubertine Auclert.