67

This number is a prime.

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If A = 1, B = 6, C = 1, D = 8, ... , (using the digits of the Golden Ratio), then 'MARIN MERSENNE' = 67; a prime exponent that he himself believed would produce a Mersenne prime number, but which later was proved to be composite [Homewood]

*67 is a common prefix code for blocking caller ID in the USA. [Homewood]

(There are 6 curios for this number that have not yet been approved by an editor.)