11976506590973322187

This number is a prime.

                                                       1197650659 0973322187

+ The only prime whose the reversal can be represented as the product of eleven successive double-digit primes, i.e., 78122337909560567911 = 43 * 47 * 53 * 59 * 61 * 67 * 71 * 73 * 79 * 83 * 89. [Loungrides]

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