650

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  6

  6 (six) is the natural number following 5 and preceding 7. The SI prefix for 1000 is exa (E), and for its reciprocal atto (a). Six is the second smallest composite number, its proper divisors being 1, 2 and 3. Since six equals the sum of these proper divisors, six is the smallest perfect number. As...
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  5

  5 (five) is a number, numeral, and glyph. It is the natural number following 4 and preceding 6. Five is between 4 and 6 and is the third prime number, after 2 and 3, and before 7. Because it can be written as 2+1, five is classified as a Fermat prime. 5 is the third Sophie Germain prime, the first...