what rank has viewers at 6.45?
CREATE TABLE table_20260 (
    "#" real,
    "Episode" text,
    "Rating" text,
    "Share" real,
    "Rating/Share (18-49)" text,
    "Viewers (millions)" text,
    "Rank (Timeslot)" text,
    "Rank (Night)" text,
    "Rank (Week)" text
)
SELECT "Rank (Week)" FROM table_20260 WHERE "Viewers (millions)" = '6.45'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: what rank has viewers at 6.45? ### Input: CREATE TABLE table_20260 (
    "#" real,
    "Episode" text,
    "Rating" text,
    "Share" real,
    "Rating/Share (18-49)" text,
    "Viewers (millions)" text,
    "Rank (Timeslot)" text,
    "Rank (Night)" text,
    "Rank (Week)" text
) ### Response: SELECT "Rank (Week)" FROM table_20260 WHERE "Viewers (millions)" = '6.45'