664664157700665 has 16 divisors (see below), whose sum is σ = 1063489099028928. Its totient is φ = 354478735204416.

The previous prime is 664664157700583. The next prime is 664664157700717. The reversal of 664664157700665 is 566007751466466.

It is a happy number.

It is not a de Polignac number, because 664664157700665 - 2²⁶ = 664664090591801 is a prime.

It is a super-4 number, since 4×664664157700665⁴ (a number of 60 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 664664157700665.

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, 550349779 + ... + 551556168.

It is an arithmetic number, because the mean of its divisors is an integer number (66468068689308).

Almost surely, 2^{664664157700665} is an apocalyptic number.

It is an amenable number.

664664157700665 is a deficient number, since it is larger than the sum of its proper divisors (398824941328263).

664664157700665 is a wasteful number, since it uses less digits than its factorization.

664664157700665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101946168.

The product of its (nonzero) digits is 914457600, while the sum is 69.

The spelling of 664664157700665 in words is "six hundred sixty-four trillion, six hundred sixty-four billion, one hundred fifty-seven million, seven hundred thousand, six hundred sixty-five".