2056256155697 has 2 divisors, whose sum is σ = 2056256155698. Its totient is φ = 2056256155696.

The previous prime is 2056256155589. The next prime is 2056256155699. The reversal of 2056256155697 is 7965516526502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2032004634256 + 24251521441 = 1425484^2 + 155729^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2056256155697 is a prime.

Together with 2056256155699, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2056256155699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1028128077848 + 1028128077849.

It is an arithmetic number, because the mean of its divisors is an integer number (1028128077849).

Almost surely, 2^{2056256155697} is an apocalyptic number.

It is an amenable number.

2056256155697 is a deficient number, since it is larger than the sum of its proper divisors (1).

2056256155697 is an equidigital number, since it uses as much as digits as its factorization.

2056256155697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020000, while the sum is 59.

The spelling of 2056256155697 in words is "two trillion, fifty-six billion, two hundred fifty-six million, one hundred fifty-five thousand, six hundred ninety-seven".