11111...11111 (1410-digits)

This number is a prime.

+ (10^1410-1)/9+5*10^655 is the smallest titanic near-repdigit prime that gives a different prime when rotated by 180 degress about an axis perpendicular to the page. Its twin prime is (10^1410-1)/9+8*10^754. [Broadhurst]

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