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The number of primes less than or equal to a thousand ((1000) = 168) equals the number of hours in a week (7 * 24 = 168). [Honaker] 168 = sigma(sigma(sigma(1+6+8))) and 1+6+8 = (1*6*8). 168 is the only number with these two properties. [Firoozbakht] All known prime powers p^n are pandigital for n > 168. [Gupta]
(There is one curio for this number that has not yet been approved by an editor.)
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