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_name_66 (area_km_2 INTEGER, population VARCHAR)
### Question:
What is the sum of the areas for populations of 542?
### Answer:
SELECT SUM(area_km_2) FROM table_name_66 WHERE population = 542