666783956179 has 8 divisors (see below), whose sum is σ = 727687200960. Its totient is φ = 605928465000.

The previous prime is 666783956081. The next prime is 666783956183. The reversal of 666783956179 is 971659387666.

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 666783956179 - 2¹¹ = 666783954131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666783953179) 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, 11909197 + ... + 11965054.

It is an arithmetic number, because the mean of its divisors is an integer number (90960900120).

Almost surely, 2^666783956179 is an apocalyptic number.

666783956179 is a deficient number, since it is larger than the sum of its proper divisors (60903244781).

666783956179 is a wasteful number, since it uses less digits than its factorization.

666783956179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23876801.

The product of its digits is 617258880, while the sum is 73.

The spelling of 666783956179 in words is "six hundred sixty-six billion, seven hundred eighty-three million, nine hundred fifty-six thousand, one hundred seventy-nine".