205245717057 has 24 divisors (see below), whose sum is σ = 297207518400. Its totient is φ = 136488512160.

The previous prime is 205245717049. The next prime is 205245717163. The reversal of 205245717057 is 750717542502.

205245717057 is a `hidden beast` number, since 2 + 0 + 5 + 2 + 4 + 571 + 70 + 5 + 7 = 666.

It is not a de Polignac number, because 205245717057 - 2³ = 205245717049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205245767057) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11163082 + ... + 11181452.

It is an arithmetic number, because the mean of its divisors is an integer number (12383646600).

Almost surely, 2^205245717057 is an apocalyptic number.

It is an amenable number.

205245717057 is a deficient number, since it is larger than the sum of its proper divisors (91961801343).

205245717057 is a wasteful number, since it uses less digits than its factorization.

205245717057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21413 (or 21410 counting only the distinct ones).

The product of its (nonzero) digits is 686000, while the sum is 45.

The spelling of 205245717057 in words is "two hundred five billion, two hundred forty-five million, seven hundred seventeen thousand, fifty-seven".