45 = 3 * 3 * 5 = 32 * 5
63 = 3 * 3 * 7 = 32 * 7
81 = 3 * 3 * 3 * 3 = 34
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81 = 34
The product of its prime factors are: 3*3*3*3 = 81
3❹ * 1 = 81
It is: 2*41 = 81
If you mean 81 then as a product of its prime factors 3*3*3*3 = 81 or in exponents 3^4 = 81