The largest known Wieferich prime: 35112 divides 23511 - 1 - 1.
The only known Wieferich emirp. [Loungrides]
The smallest emirp formed by concatenating the ordered factors of a sphenic number (i.e., 165 = 3*5*11). [Loungrides]
sqrt(3511-15*7#) and sqrt(3511+7#) produce a pair of
invertible primes, 19 and 61. [Galliani]
(There are 3 curios for this number that have not yet been approved by an editor.)
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