663657885 has 24 divisors (see below), whose sum is σ = 1254917664. Its totient is φ = 321773280.

The previous prime is 663657823. The next prime is 663657887. The reversal of 663657885 is 588756366.

663657885 is a `hidden beast` number, since 6 + 63 + 6 + 578 + 8 + 5 = 666.

It is not a de Polignac number, because 663657885 - 2⁸ = 663657629 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663657887) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 669867 + ... + 670856.

It is an arithmetic number, because the mean of its divisors is an integer number (52288236).

Almost surely, 2^663657885 is an apocalyptic number.

It is an amenable number.

663657885 is a deficient number, since it is larger than the sum of its proper divisors (591259779).

663657885 is a wasteful number, since it uses less digits than its factorization.

663657885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340745 (or 1340742 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The square root of 663657885 is about 25761.5582797314. The cubic root of 663657885 is about 872.2642762407.

The spelling of 663657885 in words is "six hundred sixty-three million, six hundred fifty-seven thousand, eight hundred eighty-five".