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_24781886_2 (_number INTEGER, viewers VARCHAR)
### Question:
When 7.55 is the amount of viewers what is the lowest number?
### Answer:
SELECT MIN(_number) FROM table_24781886_2 WHERE viewers = "7.55"