7 and 13 are already prime, no factorization required.
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The prime factorization of 455 is: 5 x 7 x 13
273 = 3*7*13
As a product of its prime factors: 2*7*7*13 = 1274 or as 2*72*13 = 1274
As a product of its prime factors: 7*11*13 = 1001
2 * 2 * 3 * 7 * 13