Who was the winner when the total attendance was 16597?
CREATE TABLE "table1_1672976_5" (
  "date" text,
  "time" text,
  "acc_team" text,
  "big_ten_team" text,
  "location" text,
  "television" text,
  "attendance" real,
  "winner" text,
  "challenge_leader" text
);
SELECT "winner" FROM "table1_1672976_5" WHERE "attendance"=16597;