256601136776779 has 2 divisors, whose sum is σ = 256601136776780. Its totient is φ = 256601136776778.

The previous prime is 256601136776689. The next prime is 256601136776791. The reversal of 256601136776779 is 977677631106652.

256601136776779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256601136776779 - 2¹⁵ = 256601136744011 is a prime.

It is a super-2 number, since 2×256601136776779² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256601131776779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128300568388389 + 128300568388390.

It is an arithmetic number, because the mean of its divisors is an integer number (128300568388390).

Almost surely, 2^{256601136776779} is an apocalyptic number.

256601136776779 is a deficient number, since it is larger than the sum of its proper divisors (1).

256601136776779 is an equidigital number, since it uses as much as digits as its factorization.

256601136776779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840157920, while the sum is 73.

The spelling of 256601136776779 in words is "two hundred fifty-six trillion, six hundred one billion, one hundred thirty-six million, seven hundred seventy-six thousand, seven hundred seventy-nine".