Negative numbers don't have prime factorizations.
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That's the prime factorization of 160.
25 x 5 = 160
I would assume -1, which is not prime and must be part of the factorization to make the negative number negative.
25 x 5
160 80,2 40,2,2 20,2,2,2 10,2,2,2,2 5,2,2,2,2,2