99999...99999 (225-digits)

This number is a prime.

                                                            99999 9999999999
9999999999 9999999999 9999999999 9999999999 9999999999 9999999999 9999999999
9999999999 9999999999 9999999599 9999999999 9999999999 9999999999 9999999999
9999999999 9999999999 9999999999 9999999999 9999999999 9999999999 9999999999

+ The only near-repdigit square-congruent prime of order 15. [Loungrides]

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