6656879 has 2 divisors, whose sum is σ = 6656880. Its totient is φ = 6656878.

The previous prime is 6656861. The next prime is 6656887. The reversal of 6656879 is 9786566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6656879 - 2⁸ = 6656623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6656899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3328439 + 3328440.

It is an arithmetic number, because the mean of its divisors is an integer number (3328440).

Almost surely, 2^6656879 is an apocalyptic number.

6656879 is a deficient number, since it is larger than the sum of its proper divisors (1).

6656879 is an equidigital number, since it uses as much as digits as its factorization.

6656879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 47.

The square root of 6656879 is about 2580.0928277874. The cubic root of 6656879 is about 188.1150551948.

The spelling of 6656879 in words is "six million, six hundred fifty-six thousand, eight hundred seventy-nine".