666432623879 has 8 divisors (see below), whose sum is σ = 758626860672. Its totient is φ = 579506629240.

The previous prime is 666432623851. The next prime is 666432623891. The reversal of 666432623879 is 978326234666.

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

It is a de Polignac number, because none of the positive numbers 2^k-666432623879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666432623279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1317060269 + ... + 1317060774.

It is an arithmetic number, because the mean of its divisors is an integer number (94828357584).

Almost surely, 2^666432623879 is an apocalyptic number.

666432623879 is a deficient number, since it is larger than the sum of its proper divisors (92194236793).

666432623879 is a wasteful number, since it uses less digits than its factorization.

666432623879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2634121077.

The product of its digits is 94058496, while the sum is 62.

The spelling of 666432623879 in words is "six hundred sixty-six billion, four hundred thirty-two million, six hundred twenty-three thousand, eight hundred seventy-nine".