663897688 has 16 divisors (see below), whose sum is σ = 1246707000. Its totient is φ = 331442496.

The previous prime is 663897679. The next prime is 663897721. The reversal of 663897688 is 886798366.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57693 + ... + 68236.

Almost surely, 2^663897688 is an apocalyptic number.

It is an amenable number.

663897688 is a deficient number, since it is larger than the sum of its proper divisors (582809312).

663897688 is a wasteful number, since it uses less digits than its factorization.

663897688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126594 (or 126590 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 61.

The square root of 663897688 is about 25766.2121391562. The cubic root of 663897688 is about 872.3693235381.

The spelling of 663897688 in words is "six hundred sixty-three million, eight hundred ninety-seven thousand, six hundred eighty-eight".