6666778 has 8 divisors (see below), whose sum is σ = 10097568. Its totient is φ = 3300924.

The previous prime is 6666769. The next prime is 6666791. The reversal of 6666778 is 8776666.

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

It is a plaindrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15976 + ... + 16387.

It is an arithmetic number, because the mean of its divisors is an integer number (1262196).

Almost surely, 2^6666778 is an apocalyptic number.

6666778 is a deficient number, since it is larger than the sum of its proper divisors (3430790).

6666778 is a wasteful number, since it uses less digits than its factorization.

6666778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32468.

The product of its digits is 508032, while the sum is 46.

The square root of 6666778 is about 2582.0104569889. The cubic root of 6666778 is about 188.2082534572.

The spelling of 6666778 in words is "six million, six hundred sixty-six thousand, seven hundred seventy-eight".