99999...89999 (100-digits)

This number is a prime.

                                            9999999999 9999999999 9999999999
9999999999 9999999999 9999999999 9999999999 9999999999 9999999999 9999989999

+ The largest near-repdigit prime less than a googol. [Gupta]

(There is one curio for this number that has not yet been approved by an editor.)

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