general_fact: 18355 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 18355 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 18355 is an unremarkable number.
historical_date: April 2nd is the day in 1902 that Dmitry Sipyagin, Minister of Interior of the Russian Empire, is assassinated in the Marie Palace, St Petersburg.