668774188567 has 8 divisors (see below), whose sum is σ = 708843126672. Its totient is φ = 628786281600.

The previous prime is 668774188451. The next prime is 668774188583. The reversal of 668774188567 is 765881477866.

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

It is a cyclic number.

It is not a de Polignac number, because 668774188567 - 2¹⁵ = 668774155799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 668774188567.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668774188067) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 20240784 + ... + 20273797.

It is an arithmetic number, because the mean of its divisors is an integer number (88605390834).

Almost surely, 2^668774188567 is an apocalyptic number.

668774188567 is a deficient number, since it is larger than the sum of its proper divisors (40068938105).

668774188567 is a wasteful number, since it uses less digits than its factorization.

668774188567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40515569.

The product of its digits is 758661120, while the sum is 73.

The spelling of 668774188567 in words is "six hundred sixty-eight billion, seven hundred seventy-four million, one hundred eighty-eight thousand, five hundred sixty-seven".