666442079 has 8 divisors (see below), whose sum is σ = 683160192. Its totient is φ = 649779480.

The previous prime is 666442067. The next prime is 666442151. The reversal of 666442079 is 970244666.

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 666442079 - 2⁸ = 666441823 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 (666442379) 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, 10982 + ... + 38124.

It is an arithmetic number, because the mean of its divisors is an integer number (85395024).

Almost surely, 2^666442079 is an apocalyptic number.

666442079 is a deficient number, since it is larger than the sum of its proper divisors (16718113).

666442079 is a wasteful number, since it uses less digits than its factorization.

666442079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27757.

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 666442079 is about 25815.5394869059. The cubic root of 666442079 is about 873.4823560194.

The spelling of 666442079 in words is "six hundred sixty-six million, four hundred forty-two thousand, seventy-nine".