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+ 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 after position 1657 (after the decimal point) of pi. It is the 5th term of Sloane A158247: 3, 535, 72535, 575272, 57352552, ... [Johnson]




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