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This number is a prime.
7853 is the largest prime factor of the number written with three ones: 11! - 1 = 13 * 17 * 23 * 7853. [Post]
The largest 4-digit prime made up from the complementary digits of the smallest distinct-prime-digit emirp, 3257. [Loungrides]
(There are 2 curios for this number that have not yet been approved by an editor.)
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