9911
This number is a composite.
The sum of prime factors of 9911 (11 + 17 + 53) is equal to
the product of digits of 9911 (9 * 9 * 1 * 1). [Gudipati]
The largest zygodrome 2-sphenic number, i.e., 9911 = 11 x
17 x 53. [Loungrides]
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