205245717056 has 28 divisors (see below), whose sum is σ = 407301379452. Its totient is φ = 102618597888.

The previous prime is 205245717049. The next prime is 205245717163. The reversal of 205245717056 is 650717542502.

It can be written as a sum of positive squares in 2 ways, for example, as 102538286656 + 102707430400 = 320216^2 + 320480^2 .

It is a junction number, because it is equal to n+sod(n) for n = 205245716998 and 205245717016.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1969886 + ... + 2071458.

Almost surely, 2^205245717056 is an apocalyptic number.

It is an amenable number.

205245717056 is a deficient number, since it is larger than the sum of its proper divisors (202055662396).

205245717056 is a wasteful number, since it uses less digits than its factorization.

205245717056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133158 (or 133148 counting only the distinct ones).

The product of its (nonzero) digits is 588000, while the sum is 44.

The spelling of 205245717056 in words is "two hundred five billion, two hundred forty-five million, seven hundred seventeen thousand, fifty-six".