general_fact: 68623 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 68623 is a boring number.
trivia: 68623 is an uninteresting number.
historical_date: November 18th is the day in 1421 that a seawall at the Zuiderzee dike in the Netherlands breaks, flooding 72 villages and killing about 10,000 people.