For any number, there is only one prime factorisation. That is a very important theorem of arithmetic and asking "what arethe prime factorisation for a number" makes no sense.
The prime factorisation (factorazation, even) of 160 is 2*2*2*2*2*5
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Prime factorization of 45 = 3x3x5Prime factorization of 60 = 2x2x3x5Prime factorization of 160 = 2x2x2x2x2x5Only common factors are 5 (and 1).Therefore GCF = 5.
160 = 2 x 2 x 2 x 2 x 2 x 5
2 x 2 x 2 x 2 x 2 x 5
5 x 7 = 35
2^5 x 5