Fatto generale: 18558 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 18558 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 18558 is an uninteresting number.
Data storica: October 22nd is the day in 1866 that a plebiscite ratifies the annexion of Veneto and Mantua to Italy, occurred three days before, on October 19.