60000...00091 (38-digits)

This number is a prime.

60000000 0000000000 0000000000 0000000091

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The prime number 60000000000000000000000000000000000091 turned upside down (i.e., 16*10^36+9) is a semiprime. Can you find a larger prime like this?

Submitted: 2022-02-08 12:53:17; Last Modified: 2022-02-08 18:40:53.