318394920665 has 16 divisors (see below), whose sum is σ = 388033752960. Its totient is φ = 250747749120.

The previous prime is 318394920647. The next prime is 318394920673. The reversal of 318394920665 is 566029493813.

It is a happy number.

It is not a de Polignac number, because 318394920665 - 2⁶ = 318394920601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 318394920665.

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, 191681 + ... + 820689.

It is an arithmetic number, because the mean of its divisors is an integer number (24252109560).

Almost surely, 2^318394920665 is an apocalyptic number.

It is an amenable number.

318394920665 is a deficient number, since it is larger than the sum of its proper divisors (69638832295).

318394920665 is a wasteful number, since it uses less digits than its factorization.

318394920665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630592.

The product of its (nonzero) digits is 8398080, while the sum is 56.

The spelling of 318394920665 in words is "three hundred eighteen billion, three hundred ninety-four million, nine hundred twenty thousand, six hundred sixty-five".