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+ The largest prime factor of 123456. Note that 643(64*3) = 123456. [De Montagu]

+ 643 millimetres is the record monthly rainfall in Sydney (from June 1950).

+ 643 = (38 + 83)/(3 + 8). [Trotter]

+ There is a 6-4-3 double play in baseball. [Patterson]

+ According to "The New Book of Prime Number Records," the product of the first 643 primes plus one is prime. This integer consists of 2038 digits and is known in MATHEMATICA as Euclid [643]. Also note that 643 is a prime. [Schiffman]

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




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