256741115677 has 2 divisors, whose sum is σ = 256741115678. Its totient is φ = 256741115676.

The previous prime is 256741115633. The next prime is 256741115699. The reversal of 256741115677 is 776511147652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176678149561 + 80062966116 = 420331^2 + 282954^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256741115677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256741115077) 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, 128370557838 + 128370557839.

It is an arithmetic number, because the mean of its divisors is an integer number (128370557839).

Almost surely, 2^256741115677 is an apocalyptic number.

It is an amenable number.

256741115677 is a deficient number, since it is larger than the sum of its proper divisors (1).

256741115677 is an equidigital number, since it uses as much as digits as its factorization.

256741115677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2469600, while the sum is 52.

The spelling of 256741115677 in words is "two hundred fifty-six billion, seven hundred forty-one million, one hundred fifteen thousand, six hundred seventy-seven".