99999...99999 (100-digits)

This number is a prime.

                                            9999999999 9999999999 9999999999
9999999999 9999999999 9999999999 9999999999 9999999999 9999999999 9999499999

+ The largest near-repdigit prime, less than a googol, with only square digits. [Loungrides]

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