99999...99827 (120-digits)
This number is a prime.
9999999999 9999999999 9999999999 9999999999 9999999999
9999999999 9999999999 9999999999 9999999999 9999999999 9999999999 9999999827
10^120 - 173 is the largest prime less than a British vigintillion. [Hartley]
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