663616408177808 has 20 divisors (see below), whose sum is σ = 1286601017281008. Its totient is φ = 331590339202080.

The previous prime is 663616408177769. The next prime is 663616408177813. The reversal of 663616408177808 is 808771804616366.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13616530298 + ... + 13616579033.

Almost surely, 2^{663616408177808} is an apocalyptic number.

It is an amenable number.

663616408177808 is a deficient number, since it is larger than the sum of its proper divisors (622984609103200).

663616408177808 is a wasteful number, since it uses less digits than its factorization.

663616408177808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27233110862 (or 27233110856 counting only the distinct ones).

The product of its (nonzero) digits is 390168576, while the sum is 71.

The spelling of 663616408177808 in words is "six hundred sixty-three trillion, six hundred sixteen billion, four hundred eight million, one hundred seventy-seven thousand, eight hundred eight".