CREATE TABLE table_18274425_1 (no_in_season VARCHAR, us_viewers__millions_ VARCHAR)

How many episodes had a viewership of 2.65 million?
SELECT COUNT(no_in_season) FROM table_18274425_1 WHERE us_viewers__millions_ = "2.65"
SELECT COUNT("no_in_season") FROM "table_18274425_1" WHERE "2.65" = "us_viewers__millions_"