Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_22347090_6 (directed_by VARCHAR, us_viewers__million_ VARCHAR)
### Question:
How many directors are there for the episode that had 1.59 million U.S. viewers?
### Answer:
SELECT COUNT(directed_by) FROM table_22347090_6 WHERE us_viewers__million_ = "1.59"