663601916 has 12 divisors (see below), whose sum is σ = 1172802120. Its totient is φ = 328515600.

The previous prime is 663601871. The next prime is 663601921. The reversal of 663601916 is 619106366.

It is a happy number.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 663601916.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 820886 + ... + 821693.

It is an arithmetic number, because the mean of its divisors is an integer number (97733510).

Almost surely, 2^663601916 is an apocalyptic number.

It is an amenable number.

663601916 is a deficient number, since it is larger than the sum of its proper divisors (509200204).

663601916 is a wasteful number, since it uses less digits than its factorization.

663601916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642684 (or 1642682 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 663601916 is about 25760.4719677261. The cubic root of 663601916 is about 872.2397550063.

The spelling of 663601916 in words is "six hundred sixty-three million, six hundred one thousand, nine hundred sixteen".