256477623442297 has 2 divisors, whose sum is σ = 256477623442298. Its totient is φ = 256477623442296.

The previous prime is 256477623442273. The next prime is 256477623442331. The reversal of 256477623442297 is 792244326774652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242592430993641 + 13885192448656 = 15575379^2 + 3726284^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256477623442297 is a prime.

It is not a weakly prime, because it can be changed into another prime (256477623442247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128238811721148 + 128238811721149.

It is an arithmetic number, because the mean of its divisors is an integer number (128238811721149).

Almost surely, 2^{256477623442297} is an apocalyptic number.

It is an amenable number.

256477623442297 is a deficient number, since it is larger than the sum of its proper divisors (1).

256477623442297 is an equidigital number, since it uses as much as digits as its factorization.

256477623442297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1706987520, while the sum is 70.

The spelling of 256477623442297 in words is "two hundred fifty-six trillion, four hundred seventy-seven billion, six hundred twenty-three million, four hundred forty-two thousand, two hundred ninety-seven".