CREATE TABLE table_28233 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( million ) " TEXT)

what is the latest episode in the series that had 16.17 million u.s. viewers?
SELECT MAX("No. in series") FROM table_28233 WHERE "U.S. viewers (million)" = '16.17'
SELECT MAX("No. in series") FROM "table_28233" WHERE "U.S. viewers (million)" = '16.17'