11111...11111 (100-digits)

This number is a prime.

                                            1111111111 1111112111 1111111111
1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111

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The largest prime less than a googol whose product of digits is prime. [Gupta]

Submitted: 2019-07-27 00:02:18;   Last Modified: 2020-06-13 08:30:06.
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