6666879 has 4 divisors (see below), whose sum is σ = 8889176. Its totient is φ = 4444584.

The previous prime is 6666841. The next prime is 6666883. The reversal of 6666879 is 9786666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6666879 - 2¹¹ = 6664831 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666379) 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, 1111144 + ... + 1111149.

It is an arithmetic number, because the mean of its divisors is an integer number (2222294).

Almost surely, 2^6666879 is an apocalyptic number.

6666879 is a deficient number, since it is larger than the sum of its proper divisors (2222297).

6666879 is a wasteful number, since it uses less digits than its factorization.

6666879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222296.

The product of its digits is 653184, while the sum is 48.

The square root of 6666879 is about 2582.0300153174. The cubic root of 6666879 is about 188.2092038882.

The spelling of 6666879 in words is "six million, six hundred sixty-six thousand, eight hundred seventy-nine".