663647836 has 48 divisors (see below), whose sum is σ = 1270467072. Its totient is φ = 302054400.

The previous prime is 663647801. The next prime is 663647837. The reversal of 663647836 is 638746366.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 663647836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663647837) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 479866 + ... + 481246.

It is an arithmetic number, because the mean of its divisors is an integer number (26468064).

Almost surely, 2^663647836 is an apocalyptic number.

It is an amenable number.

663647836 is a deficient number, since it is larger than the sum of its proper divisors (606819236).

663647836 is a wasteful number, since it uses less digits than its factorization.

663647836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630 (or 1628 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 49.

The square root of 663647836 is about 25761.3632403256. The cubic root of 663647836 is about 872.2598736571.

The spelling of 663647836 in words is "six hundred sixty-three million, six hundred forty-seven thousand, eight hundred thirty-six".