As a product of its prime factors: 3*3*7 = 63
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The factors of 63 are: 1 3 7 9 21 63. The prime factors are: 3 and 7
Yes, 143 and 63 are relatively prime because they have no prime factors in common.
It is 7 because the product of its prime factors are: 3*3*7 = 63
63 = 32 x 71
63 is composite: its factors are 1, 3, 7, 9, 21 and 63.