CREATE TABLE table_2737 ("No." FLOAT, "#" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "U.S. viewers  ( million ) " TEXT, "Rank  ( week ) " FLOAT, "Original air date" TEXT)

How many million viewers did episode number 63 have?
SELECT "U.S. viewers (million)" FROM table_2737 WHERE "No." = '63'
SELECT "U.S. viewers (million)" FROM "table_2737" WHERE "No." = '63'