256515705012397 has 2 divisors, whose sum is σ = 256515705012398. Its totient is φ = 256515705012396.

The previous prime is 256515705012379. The next prime is 256515705012461. The reversal of 256515705012397 is 793210507515652.

256515705012397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (256515705012379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 256511327072841 + 4377939556 = 16015971^2 + 66166^2 .

It is a cyclic number.

It is not a de Polignac number, because 256515705012397 - 2⁷ = 256515705012269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256515705016397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128257852506198 + 128257852506199.

It is an arithmetic number, because the mean of its divisors is an integer number (128257852506199).

Almost surely, 2^{256515705012397} is an apocalyptic number.

It is an amenable number.

256515705012397 is a deficient number, since it is larger than the sum of its proper divisors (1).

256515705012397 is an equidigital number, since it uses as much as digits as its factorization.

256515705012397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19845000, while the sum is 58.

The spelling of 256515705012397 in words is "two hundred fifty-six trillion, five hundred fifteen billion, seven hundred five million, twelve thousand, three hundred ninety-seven".