1001 has three prime factors. Each of these is of multiplicity one. In all, therefore it has 2*2*2 = 8 factors.
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The factors of 1001 are 1, 7, 11, 13, 77, 91, 143, 1001. For them to be common, they need to be compared to another set of factors.
The positive factors of 1001 are: 1, 7, 11, 13, 77, 91, 143, 1001.
16 factors: 1 2 7 11 13 14 22 26 77 91 143 154 182 286 1001 2002.
It is because 7*11*13 = 1001. so abcabc = abc*1001 = abc*(7*11*13)
1001