663631567 has 12 divisors (see below), whose sum is σ = 711466360. Its totient is φ = 618834816.

The previous prime is 663631559. The next prime is 663631571. The reversal of 663631567 is 765136366.

It is not a de Polignac number, because 663631567 - 2³ = 663631559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663661567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20968 + ... + 42034.

Almost surely, 2^663631567 is an apocalyptic number.

663631567 is a deficient number, since it is larger than the sum of its proper divisors (47834793).

663631567 is a wasteful number, since it uses less digits than its factorization.

663631567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21210 (or 21193 counting only the distinct ones).

The product of its digits is 408240, while the sum is 43.

The square root of 663631567 is about 25761.0474748214. The cubic root of 663631567 is about 872.2527459251.

The spelling of 663631567 in words is "six hundred sixty-three million, six hundred thirty-one thousand, five hundred sixty-seven".