256022655144521 has 2 divisors, whose sum is σ = 256022655144522. Its totient is φ = 256022655144520.

The previous prime is 256022655144467. The next prime is 256022655144569. The reversal of 256022655144521 is 125441556220652.

256022655144521 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 can be written as a sum of positive squares in only one way, i.e., 254604147942400 + 1418507202121 = 15956320^2 + 1191011^2 .

It is a cyclic number.

It is not a de Polignac number, because 256022655144521 - 2²² = 256022650950217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 256022655144521.

It is not a weakly prime, because it can be changed into another prime (256022655141521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128011327572260 + 128011327572261.

It is an arithmetic number, because the mean of its divisors is an integer number (128011327572261).

Almost surely, 2^{256022655144521} is an apocalyptic number.

It is an amenable number.

256022655144521 is a deficient number, since it is larger than the sum of its proper divisors (1).

256022655144521 is an equidigital number, since it uses as much as digits as its factorization.

256022655144521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760000, while the sum is 50.

The spelling of 256022655144521 in words is "two hundred fifty-six trillion, twenty-two billion, six hundred fifty-five million, one hundred forty-four thousand, five hundred twenty-one".