Monday, April 28, 2014


6623 = 37 x 179.

6623 has the property that the sum of its prime factors is equal to the product of its digits (A067173).

6623 is a centered heptagonal number (A069099).

6623 is a number n such that the nth and the (n + 1)th primes have the same sum of their digits squared (A109182).

6623 is a member of the Fibonacci-like sequence beginning with 12 and 67 (A091074).

6623 is a number that cannot be written as a sum of three squares.

Source: What's Special About This Number?

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