668632875662165 has 8 divisors (see below), whose sum is σ = 828242013723648. Its totient is φ = 517651258577040.

The previous prime is 668632875662119. The next prime is 668632875662221. The reversal of 668632875662165 is 561266578236866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 668632875662165 - 2¹⁴ = 668632875645781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2156880243917 + ... + 2156880244226.

It is an arithmetic number, because the mean of its divisors is an integer number (103530251715456).

Almost surely, 2^{668632875662165} is an apocalyptic number.

It is an amenable number.

668632875662165 is a deficient number, since it is larger than the sum of its proper divisors (159609138061483).

668632875662165 is a wasteful number, since it uses less digits than its factorization.

668632875662165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4313760488179.

The product of its digits is 6270566400, while the sum is 77.

The spelling of 668632875662165 in words is "six hundred sixty-eight trillion, six hundred thirty-two billion, eight hundred seventy-five million, six hundred sixty-two thousand, one hundred sixty-five".