256743032216245 has 4 divisors (see below), whose sum is σ = 308091638659500. Its totient is φ = 205394425772992.

The previous prime is 256743032216221. The next prime is 256743032216323. The reversal of 256743032216245 is 542612230347652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27256345419121 + 229486686797124 = 5220761^2 + 15148818^2 .

It is a cyclic number.

It is not a de Polignac number, because 256743032216245 - 2²⁹ = 256742495345333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256743032216192 and 256743032216201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25674303221620 + ... + 25674303221629.

It is an arithmetic number, because the mean of its divisors is an integer number (77022909664875).

Almost surely, 2^{256743032216245} is an apocalyptic number.

It is an amenable number.

256743032216245 is a deficient number, since it is larger than the sum of its proper divisors (51348606443255).

256743032216245 is an equidigital number, since it uses as much as digits as its factorization.

256743032216245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51348606443254.

The product of its (nonzero) digits is 14515200, while the sum is 52.

The spelling of 256743032216245 in words is "two hundred fifty-six trillion, seven hundred forty-three billion, thirty-two million, two hundred sixteen thousand, two hundred forty-five".