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444^444  444! + 444*444  444/444 is a 1176digit prime. [Firoozbakht]
444^4 + 444^4 + 444^4  1 is prime. [Patterson] 444^444 + 5 is prime. Note that 444 is the only known number m such that m^m + 5 is prime. [Firoozbakht] 444 = prime(4+4+4)*(4+4+4). It is the only repdigit number with this property. [Firoozbakht]
(There is one curio for this number that has not yet been approved by an editor.)
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