663655655 has 16 divisors (see below), whose sum is σ = 902788320. Its totient is φ = 464289408.

The previous prime is 663655649. The next prime is 663655697. The reversal of 663655655 is 556556366.

It is a cyclic number.

It is not a de Polignac number, because 663655655 - 2¹⁴ = 663639271 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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, 267452 + ... + 269921.

It is an arithmetic number, because the mean of its divisors is an integer number (56424270).

Almost surely, 2^663655655 is an apocalyptic number.

663655655 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

663655655 is a deficient number, since it is larger than the sum of its proper divisors (239132665).

663655655 is a wasteful number, since it uses less digits than its factorization.

663655655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537410.

The product of its digits is 2430000, while the sum is 47.

The square root of 663655655 is about 25761.5149981518. The cubic root of 663655655 is about 872.2632992557.

The spelling of 663655655 in words is "six hundred sixty-three million, six hundred fifty-five thousand, six hundred fifty-five".