205640053065 has 12 divisors (see below), whose sum is σ = 356442758724. Its totient is φ = 109674694944.

The previous prime is 205640053049. The next prime is 205640053097. The reversal of 205640053065 is 560350046502.

It is a happy number.

205640053065 is a `hidden beast` number, since 2 + 0 + 5 + 64 + 0 + 0 + 530 + 65 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 111467173689 + 94172879376 = 333867^2 + 306876^2 .

It is not a de Polignac number, because 205640053065 - 2⁴ = 205640053049 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2284889434 + ... + 2284889523.

It is an arithmetic number, because the mean of its divisors is an integer number (29703563227).

Almost surely, 2^205640053065 is an apocalyptic number.

It is an amenable number.

205640053065 is a deficient number, since it is larger than the sum of its proper divisors (150802705659).

205640053065 is a wasteful number, since it uses less digits than its factorization.

205640053065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4569778968 (or 4569778965 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

Adding to 205640053065 its reverse (560350046502), we get a palindrome (765990099567).

The spelling of 205640053065 in words is "two hundred five billion, six hundred forty million, fifty-three thousand, sixty-five".