66 = 21 x 31 x 111
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66 = 21 x 31 x 111 (but no exponents are necessary).
66 = 2 * 33 = 2 * 3 * 11 = 21*31*111 Exponents are not normally written when their value is 1, so 66 = 2*3*11.
21*31*111 = 66
66 = 21 x 31 x 111
23 is prime, 66 is composite.