Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_66 (area_km_2 INTEGER, population VARCHAR)

### Question ###
What is the sum of the areas for populations of 542?

### Accurate SQL ###

SELECT SUM(area_km_2) FROM table_name_66 WHERE population = 542