Fatto matematico: 2606 is the number of polyhedra with 9 vertices.
Trivia: 2606 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: February 18th is the day in 1932 that the Empire of Japan declares Manzhouguo (the obsolete Chinese name for Manchuria) independent from the Republic of China.