256044460686281 has 2 divisors, whose sum is σ = 256044460686282. Its totient is φ = 256044460686280.

The previous prime is 256044460686277. The next prime is 256044460686337. The reversal of 256044460686281 is 182686064440652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205185312652681 + 50859148033600 = 14324291^2 + 7131560^2 .

It is a cyclic number.

It is not a de Polignac number, because 256044460686281 - 2² = 256044460686277 is a prime.

It is a super-2 number, since 2×256044460686281² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256044460682281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128022230343140 + 128022230343141.

It is an arithmetic number, because the mean of its divisors is an integer number (128022230343141).

Almost surely, 2^{256044460686281} is an apocalyptic number.

It is an amenable number.

256044460686281 is a deficient number, since it is larger than the sum of its proper divisors (1).

256044460686281 is an equidigital number, since it uses as much as digits as its factorization.

256044460686281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 106168320, while the sum is 62.

The spelling of 256044460686281 in words is "two hundred fifty-six trillion, forty-four billion, four hundred sixty million, six hundred eighty-six thousand, two hundred eighty-one".