# 166

$t_title is "166"

$t_adjust_path is "/~caldwell/curios/"

$t_class is "composite"

$short is "166"

$nunber_id is "1215"

$t_meta['description'] is "One of many pages of prime number
curiosities and trivia. This page discusses 166
Come explore a new prime today!"

166 is the smallest number such that the number and its reversal are both congruent to 1 mod *p* for the same set of some three distinct odd primes (166 = 661 = 1 mod (3, 5, 11)). [Thoms]

166!-1 is a factorial minus one prime. [Dobb]

The smallest Smith number that is prime when reversed (661), turned upside down (991), and reversed-then-turned upside down (199). You get the next case by inserting a zero between the digits (10606). [Capelle]

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