668772251472205 has 32 divisors (see below), whose sum is σ = 860347785600000. Its totient is φ = 497753733894912.

The previous prime is 668772251472167. The next prime is 668772251472263. The reversal of 668772251472205 is 502274152277866.

It is a cyclic number.

It is not a de Polignac number, because 668772251472205 - 2²⁵ = 668772217917773 is a prime.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 14637205 + ... + 39392794.

It is an arithmetic number, because the mean of its divisors is an integer number (26885868300000).

Almost surely, 2^{668772251472205} is an apocalyptic number.

It is an amenable number.

668772251472205 is a deficient number, since it is larger than the sum of its proper divisors (191575534127795).

668772251472205 is a wasteful number, since it uses less digits than its factorization.

668772251472205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54032973.

The product of its (nonzero) digits is 158054400, while the sum is 64.

The spelling of 668772251472205 in words is "six hundred sixty-eight trillion, seven hundred seventy-two billion, two hundred fifty-one million, four hundred seventy-two thousand, two hundred five".