6666878 has 4 divisors (see below), whose sum is σ = 10000320. Its totient is φ = 3333438.

The previous prime is 6666841. The next prime is 6666883. The reversal of 6666878 is 8786666.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1666718 + ... + 1666721.

It is an arithmetic number, because the mean of its divisors is an integer number (2500080).

Almost surely, 2^6666878 is an apocalyptic number.

6666878 is a deficient number, since it is larger than the sum of its proper divisors (3333442).

6666878 is a wasteful number, since it uses less digits than its factorization.

6666878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3333441.

The product of its digits is 580608, while the sum is 47.

The square root of 6666878 is about 2582.0298216713. The cubic root of 6666878 is about 188.2091944780.

The spelling of 6666878 in words is "six million, six hundred sixty-six thousand, eight hundred seventy-eight".