256235846054521 has 2 divisors, whose sum is σ = 256235846054522. Its totient is φ = 256235846054520.

The previous prime is 256235846054473. The next prime is 256235846054599. The reversal of 256235846054521 is 125450648532652.

256235846054521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151683585048121 + 104552261006400 = 12315989^2 + 10225080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256235846054521 is a prime.

It is not a weakly prime, because it can be changed into another prime (256235840054521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128117923027260 + 128117923027261.

It is an arithmetic number, because the mean of its divisors is an integer number (128117923027261).

Almost surely, 2^{256235846054521} is an apocalyptic number.

It is an amenable number.

256235846054521 is a deficient number, since it is larger than the sum of its proper divisors (1).

256235846054521 is an equidigital number, since it uses as much as digits as its factorization.

256235846054521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120000, while the sum is 58.

The spelling of 256235846054521 in words is "two hundred fifty-six trillion, two hundred thirty-five billion, eight hundred forty-six million, fifty-four thousand, five hundred twenty-one".