This number is a prime.
The smallest palindromic beastly prime.
16661 is the 1928th prime. Note that 1 + 6 + 6 + 6 + 1 = 1 + 9 + 2 + 8. (See "The Most Evil Number" on Numberphile @ time 2:00.)
The smallest invertible palindromic prime. [Capelle]
16661 divides 949 + 1. [De Geest]
The smallest palindromic beastly prime that is the sum of 9 consecutive primes. [Green]
16661 is congruent to 11 (mod 666), an expression containing the exact digits of the palindromic prime itself. [Green]
The only known invertible beastly Honaker prime. [Loungrides]
The smallest palindromic Honaker prime p such that p! and p^p both contain p as a string of digits. [Bajpai]
16661*(16661+1)+1 is prime. [Sariyar]
The smallest of the five "full house" Honaker primes. [Gaydos]
(There are 3 curios for this number that have not yet been approved by an editor.)
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