CREATE TABLE table_25800134_1 (series__number INT, airdate VARCHAR)

What is largest series number for the episode that aired February 16, 1957?
SELECT MAX(series__number) FROM table_25800134_1 WHERE airdate = "February 16, 1957"
SELECT MAX("series__number") FROM "table_25800134_1" WHERE "February 16, 1957" = "airdate"