6397
This number is a prime.
The largest distinct-digit prime concatenated from two double-digit numbers such that the first of them is equal to the product of the digits of the other. [Loungrides]
6397 is the smallest prime p whose digits (3,6,7,9) are the same as the digits of the p-th prime (63793 with digits 3,6,7,9). [Vantieghem]
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