Fatto matematico: 1868 is the smallest number that can not be formed using the digit 1 at most 20 times, together with the symbols +, × and ^.
Trivia: 1868 is an unremarkable number.
Data storica: February 10th is the day in 1798 that Louis Alexandre Berthier invades Rome, proclaims a Roman Republic on February 15 and then on February 20 takes Pope Pius VI prisoner.