99999...99999 (87-digits)

This number is a prime.

                                                          9999999 9999999999
9999999999 9999999999 9999991999 9999999999 9999999999 9999999999 9999999999

Just showing those entries submitted by 'Loungrides': (Click here to show all)

The largest palindromic wing prime less than a googol, containing 9's. [Loungrides]