General fact: 1855 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 1855 is the number of permutations of 7 items that fix 1 element.
Trivia: 1855 is a boring number.
Historical date: January 28th is the day in 1724 that the Russian Academy of Sciences is founded in St. Petersburg by Peter the Great, and implemented by Senate decree.