77777...25237 (100-digits)

This number is a prime.

                                            7777777777 7777777777 7777777777
7777777777 7777777777 7777777777 7777777777 7777777777 7777777777 7777525237

+ The largest prime-digit prime less than a googol containing all prime digits (2, 3, 5, 7). [Loungrides]

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