205245717163 has 2 divisors, whose sum is σ = 205245717164. Its totient is φ = 205245717162.

The previous prime is 205245717049. The next prime is 205245717247. The reversal of 205245717163 is 361717542502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205245717163 - 2⁹ = 205245716651 is a prime.

It is not a weakly prime, because it can be changed into another prime (205240717163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102622858581 + 102622858582.

It is an arithmetic number, because the mean of its divisors is an integer number (102622858582).

Almost surely, 2^205245717163 is an apocalyptic number.

205245717163 is a deficient number, since it is larger than the sum of its proper divisors (1).

205245717163 is an equidigital number, since it uses as much as digits as its factorization.

205245717163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 352800, while the sum is 43.

The spelling of 205245717163 in words is "two hundred five billion, two hundred forty-five million, seven hundred seventeen thousand, one hundred sixty-three".