Schema: CREATE TABLE table_name_51 (rank INTEGER, province VARCHAR, date_of_official_foundation_of_municipality VARCHAR)
Question: What is the sum of Rank, when Province is Gīlān, when Date of Official Foundation of Municipality is after 1922, and when 2006 is greater than 557366?
SQL: SELECT SUM(rank) FROM table_name_51 WHERE province = "gīlān" AND date_of_official_foundation_of_municipality > 1922 AND 2006 > 557366