256768654538533 has 2 divisors, whose sum is σ = 256768654538534. Its totient is φ = 256768654538532.

The previous prime is 256768654538531. The next prime is 256768654538639. The reversal of 256768654538533 is 335835456867652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 256739797702404 + 28856836129 = 16023102^2 + 169873^2 .

It is a cyclic number.

It is not a de Polignac number, because 256768654538533 - 2¹ = 256768654538531 is a prime.

Together with 256768654538531, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 256768654538533.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256768654538531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128384327269266 + 128384327269267.

It is an arithmetic number, because the mean of its divisors is an integer number (128384327269267).

Almost surely, 2^{256768654538533} is an apocalyptic number.

It is an amenable number.

256768654538533 is a deficient number, since it is larger than the sum of its proper divisors (1).

256768654538533 is an equidigital number, since it uses as much as digits as its factorization.

256768654538533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680000, while the sum is 76.

The spelling of 256768654538533 in words is "two hundred fifty-six trillion, seven hundred sixty-eight billion, six hundred fifty-four million, five hundred thirty-eight thousand, five hundred thirty-three".