6656756879 has 2 divisors, whose sum is σ = 6656756880. Its totient is φ = 6656756878.

The previous prime is 6656756849. The next prime is 6656756903. The reversal of 6656756879 is 9786576566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6656756879 is a prime.

It is a super-2 number, since 2×6656756879² = 88624824292227641282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6656756819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3328378439 + 3328378440.

It is an arithmetic number, because the mean of its divisors is an integer number (3328378440).

Almost surely, 2^6656756879 is an apocalyptic number.

6656756879 is a deficient number, since it is larger than the sum of its proper divisors (1).

6656756879 is an equidigital number, since it uses as much as digits as its factorization.

6656756879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 114307200, while the sum is 65.

The square root of 6656756879 is about 81588.9507163807. The cubic root of 6656756879 is about 1881.1390485898.

The spelling of 6656756879 in words is "six billion, six hundred fifty-six million, seven hundred fifty-six thousand, eight hundred seventy-nine".