This number is a prime.

+ 1657 = prime( (1*6*5*7) + (1+6+5+7) ) + (1*6*5*7). Note that the prime 1657 is the only number less than 10^7 with this property. [Firoozbakht]

+ Math historian and philosopher Bernard de Fontenelle was born in 1657.

+ Eight consecutive prime digits occur immediately following position 1657 (after the decimal point) of π. [Johnson]

+ The Hardy-Ramanujan number was actually discovered by Bernard Frénicle de Bessy in 1657. [Olry]

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

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