7669

This number is a prime.

+ David MacQuarrie's PrimeTimeClock will only display the time (as hours:minutes:seconds) if the corresponding number is prime. It displays 7669 different times each day and indicates whether a prime is special (e.g., a Sophie Germain prime) by illuminating its beacon in different colors.

+ The number of twin lucky numbers less than a million. [Schneider]

+ The number of primes that can appear on a 24-hour digital clock displaying hours, minutes, seconds (00:00:00 up to 23:59:59). [Gupta]

(There is one curio for this number that has not yet been approved by an editor.)

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