6666779 has 4 divisors (see below), whose sum is σ = 7619184. Its totient is φ = 5714376.

The previous prime is 6666769. The next prime is 6666791. The reversal of 6666779 is 9776666.

6666779 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 6666779 - 2⁸ = 6666523 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (6666719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476192 + ... + 476205.

It is an arithmetic number, because the mean of its divisors is an integer number (1904796).

Almost surely, 2^6666779 is an apocalyptic number.

6666779 is a deficient number, since it is larger than the sum of its proper divisors (952405).

6666779 is an equidigital number, since it uses as much as digits as its factorization.

6666779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952404.

The product of its digits is 571536, while the sum is 47.

The square root of 6666779 is about 2582.0106506364. The cubic root of 6666779 is about 188.2082628674.

The spelling of 6666779 in words is "six million, six hundred sixty-six thousand, seven hundred seventy-nine".