57
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2 x 3 x 3 x 19 = 342
855 = 3 x 3 x 5 x 19
Yes when expressed as: 1*3*19 = 57
As a product of its prime factors: 3*3*5 = 45 Or as: 23+19+3 = 45
Well, for a product, you would be multiplying. So 19 and it's opposite, -19, you would multiply them to get a product of -361.