# 6689

$t_title is "6689"

$t_adjust_path is "/~caldwell/curios/"

$t_class is "prime"

$short is "6689"

$nunber_id is "7073"

$t_meta['description'] is "One of many pages of prime number
curiosities and trivia. This page discusses 6689
Come explore a new prime today!"

The smallest invertible prime whose digits are circular and composite. [Punches]

The NSW number with index 6689 is prime. These numbers arise when addressing the following question: "Is there a finite simple group whose order is a square?"

The first occurrence of a twin prime pair (6689, 6691) that both are invertible primes. [Beedassy]

An invertible prime equal to 2^7+3^8. [Silva]

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