663956 has 12 divisors (see below), whose sum is σ = 1171968. Its totient is φ = 329112.

The previous prime is 663937. The next prime is 663959. The reversal of 663956 is 659366.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 663956.

It is not an unprimeable number, because it can be changed into a prime (663959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146 + ... + 1161.

It is an arithmetic number, because the mean of its divisors is an integer number (97664).

2⁶⁶³⁹⁵⁶ is an apocalyptic number.

It is an amenable number.

663956 is a deficient number, since it is larger than the sum of its proper divisors (508012).

663956 is a wasteful number, since it uses less digits than its factorization.

663956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438 (or 1436 counting only the distinct ones).

The product of its digits is 29160, while the sum is 35.

The square root of 663956 is about 814.8349526131. The cubic root of 663956 is about 87.2394863674.

The spelling of 663956 in words is "six hundred sixty-three thousand, nine hundred fifty-six".