Largest common factor of 180 and 97

Question

180= 2² *3² *5

Answer 1

Prime factors of 180 = 2·2·3·3·5 as you stated.  97 is a prime number so its prime factorization = 1·97.  You can always multiply 180 by one (1), so the largest common factor of 180 and 97 is 1.