666879958 has 8 divisors (see below), whose sum is σ = 1000752480. Its totient is φ = 333295800.

The previous prime is 666879929. The next prime is 666879959. The reversal of 666879958 is 859978666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 666879958.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666879959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66213 + ... + 75616.

It is an arithmetic number, because the mean of its divisors is an integer number (125094060).

Almost surely, 2^666879958 is an apocalyptic number.

666879958 is a deficient number, since it is larger than the sum of its proper divisors (333872522).

666879958 is a wasteful number, since it uses less digits than its factorization.

666879958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144182.

The product of its digits is 39191040, while the sum is 64.

The square root of 666879958 is about 25824.0190133139. The cubic root of 666879958 is about 873.6736183736.

The spelling of 666879958 in words is "six hundred sixty-six million, eight hundred seventy-nine thousand, nine hundred fifty-eight".