663916 has 24 divisors (see below), whose sum is σ = 1290240. Its totient is φ = 296400.

The previous prime is 663907. The next prime is 663937. The reversal of 663916 is 619366.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3381 + ... + 3571.

It is an arithmetic number, because the mean of its divisors is an integer number (53760).

2⁶⁶³⁹¹⁶ is an apocalyptic number.

It is an amenable number.

663916 is a deficient number, since it is larger than the sum of its proper divisors (626324).

663916 is a wasteful number, since it uses less digits than its factorization.

663916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 283 counting only the distinct ones).

The product of its digits is 5832, while the sum is 31.

The square root of 663916 is about 814.8104073955. The cubic root of 663916 is about 87.2377344192.

The spelling of 663916 in words is "six hundred sixty-three thousand, nine hundred sixteen".