Is 663 a deficient number and what is its deficiency?

Is 663 a deficient number?

Here we will explain and calculate if 663 is a deficient number and its deficiency if applicable.

663 is a deficient number if the sum of its proper divisors is less than 663.

The sum of its proper divisors is calculated as follows: 1 + 3 + 13 + 17 + 39 + 51 + 221 = 345.

345 is less than 663. Therefore, 663 is a deficient number.

The deficiency of 663 is 663 minus the sum of its proper divisors. Thus, the deficiency of 663 is 663 - 345 = 318

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