256779899 has 2 divisors, whose sum is σ = 256779900. Its totient is φ = 256779898.

The previous prime is 256779893. The next prime is 256779907. The reversal of 256779899 is 998977652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256779899 - 2⁸ = 256779643 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256779893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128389949 + 128389950.

It is an arithmetic number, because the mean of its divisors is an integer number (128389950).

Almost surely, 2^256779899 is an apocalyptic number.

256779899 is a deficient number, since it is larger than the sum of its proper divisors (1).

256779899 is an equidigital number, since it uses as much as digits as its factorization.

256779899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17146080, while the sum is 62.

The square root of 256779899 is about 16024.3533098843. The cubic root of 256779899 is about 635.6045652784.

The spelling of 256779899 in words is "two hundred fifty-six million, seven hundred seventy-nine thousand, eight hundred ninety-nine".