16911...11111 (172-digits)

This number is a prime.

                                         16 9111111111 1111111111 1111111111
1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111
1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111

+ The smallest prime greater that a googol formed from a square n followed by n 1’s, (n=169). [Loungrides]

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