66
(another Prime Pages' Curiosity)
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+ 66 is the lowest number that shares a strobogrammatic prime factor with its invertible partner, i.e., 66 and 99 are both divisible by 11. [Murton]

+ The smallest palindromic composite number n such that n^2+1 is prime. [Russo]

+ The smallest number that can be expressed as a sum of two two-digit primes, each ending with the digit three, in two different ways (66 = 13 + 53 = 23 + 43). [Sladcik]



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