6666679 has 2 divisors, whose sum is σ = 6666680. Its totient is φ = 6666678.

The previous prime is 6666617. The next prime is 6666683. The reversal of 6666679 is 9766666.

It is a happy number.

6666679 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6666679 - 2⁷ = 6666551 is a prime.

It is an Ulam number.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333339 + 3333340.

It is an arithmetic number, because the mean of its divisors is an integer number (3333340).

Almost surely, 2^6666679 is an apocalyptic number.

6666679 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666679 is an equidigital number, since it uses as much as digits as its factorization.

6666679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 46.

The square root of 6666679 is about 2581.9912858102. The cubic root of 6666679 is about 188.2073218372.

The spelling of 6666679 in words is "six million, six hundred sixty-six thousand, six hundred seventy-nine".