13 x 17 = 221
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2873 is a composite number, not a prime. Its factors are 1, 13, 17, 169, 221, and 2873, and its prime factorization is 13x13x17.
The prime factors of 221 are 13 and 17. They're the only prime numbers that will divide evenly into 221 with no remainder.
113 is already prime. No factorization.
What is the prime factorization of 256^180
3 is already prime. No factorization.