663856464658366 has 32 divisors (see below), whose sum is σ = 1138935445536960. Its totient is φ = 284285987366400.

The previous prime is 663856464658333. The next prime is 663856464658403.

663856464658366 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 663856464658366.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 367011496 + ... + 368815876.

It is an arithmetic number, because the mean of its divisors is an integer number (35591732673030).

Almost surely, 2^{663856464658366} is an apocalyptic number.

663856464658366 is a deficient number, since it is larger than the sum of its proper divisors (475078980878594).

663856464658366 is a wasteful number, since it uses less digits than its factorization.

663856464658366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825060.

The product of its digits is 64497254400, while the sum is 82.

The spelling of 663856464658366 in words is "six hundred sixty-three trillion, eight hundred fifty-six billion, four hundred sixty-four million, six hundred fifty-eight thousand, three hundred sixty-six".