91617...13973 (104-digits)

This number is a prime.

                                       9161 7596742869 6198844327 2139114537
4777686825 6342915237 7117139111 1313737919 1339773317 3713793377 3713713973

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The largest left-and-right-truncatable prime with an even number of digits. [Troisi]