256051705873 has 2 divisors, whose sum is σ = 256051705874. Its totient is φ = 256051705872.

The previous prime is 256051705783. The next prime is 256051705883. The reversal of 256051705873 is 378507150652.

Together with previous prime (256051705783) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 254730165264 + 1321540609 = 504708^2 + 36353^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256051705873 is a prime.

It is not a weakly prime, because it can be changed into another prime (256051705883) 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, 128025852936 + 128025852937.

It is an arithmetic number, because the mean of its divisors is an integer number (128025852937).

Almost surely, 2^256051705873 is an apocalyptic number.

It is an amenable number.

256051705873 is a deficient number, since it is larger than the sum of its proper divisors (1).

256051705873 is an equidigital number, since it uses as much as digits as its factorization.

256051705873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764000, while the sum is 49.

The spelling of 256051705873 in words is "two hundred fifty-six billion, fifty-one million, seven hundred five thousand, eight hundred seventy-three".