99999...99827 (120-digits)

This number is a prime.

                      9999999999 9999999999 9999999999 9999999999 9999999999
9999999999 9999999999 9999999999 9999999999 9999999999 9999999999 9999999827

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10^120 - 173 is the largest prime less than a British vigintillion. [Hartley]