Fatto generale: 18055 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 18055 is an uninteresting number.
Trivia: 18055 is an unremarkable number.
Data storica: June 6th is the day in 1644 that the Qing Dynasty Manchu forces led by the Shunzhi Emperor capture Beijing during the collapse of the Ming Dynasty.