CREATE TABLE table_28109 ("Series #" FLOAT, "Season #" FLOAT, "Title" TEXT, "Director" TEXT, "Writer ( s ) " TEXT, "Airdate" TEXT)

What is largest series number for the episode that aired February 16, 1957?
SELECT MAX("Series #") FROM table_28109 WHERE "Airdate" = 'February 16, 1957'
SELECT MAX("Series #") FROM "table_28109" WHERE "Airdate" = 'February 16, 1957'