6668668879 has 2 divisors, whose sum is σ = 6668668880. Its totient is φ = 6668668878.

The previous prime is 6668668861. The next prime is 6668668891. The reversal of 6668668879 is 9788668666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6668668879 - 2⁵ = 6668668847 is a prime.

It is a super-2 number, since 2×6668668879² = 88942289235486233282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6668668679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334334439 + 3334334440.

It is an arithmetic number, because the mean of its divisors is an integer number (3334334440).

Almost surely, 2^6668668879 is an apocalyptic number.

6668668879 is a deficient number, since it is larger than the sum of its proper divisors (1).

6668668879 is an equidigital number, since it uses as much as digits as its factorization.

6668668879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 250822656, while the sum is 70.

The square root of 6668668879 is about 81661.9181687523. The cubic root of 6668668879 is about 1882.2604542971.

The spelling of 6668668879 in words is "six billion, six hundred sixty-eight million, six hundred sixty-eight thousand, eight hundred seventy-nine".