663602655 has 16 divisors (see below), whose sum is σ = 1069517664. Its totient is φ = 351336960.

The previous prime is 663602609. The next prime is 663602669. The reversal of 663602655 is 556206366.

It is not a de Polignac number, because 663602655 - 2²⁷ = 529384927 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159406 + ... + 163515.

It is an arithmetic number, because the mean of its divisors is an integer number (66844854).

Almost surely, 2^663602655 is an apocalyptic number.

663602655 is a deficient number, since it is larger than the sum of its proper divisors (405915009).

663602655 is a wasteful number, since it uses less digits than its factorization.

663602655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323066.

The product of its (nonzero) digits is 194400, while the sum is 39.

The square root of 663602655 is about 25760.4863114034. The cubic root of 663602655 is about 872.2400787872.

The spelling of 663602655 in words is "six hundred sixty-three million, six hundred two thousand, six hundred fifty-five".