205717065 has 16 divisors (see below), whose sum is σ = 332062848. Its totient is φ = 108743936.

The previous prime is 205717007. The next prime is 205717067. The reversal of 205717065 is 560717502.

205717065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 205717065 - 2⁷ = 205716937 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (205717067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58989 + ... + 62378.

It is an arithmetic number, because the mean of its divisors is an integer number (20753928).

Almost surely, 2^205717065 is an apocalyptic number.

It is an amenable number.

205717065 is a deficient number, since it is larger than the sum of its proper divisors (126345783).

205717065 is a wasteful number, since it uses less digits than its factorization.

205717065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121488.

The product of its (nonzero) digits is 14700, while the sum is 33.

The square root of 205717065 is about 14342.8401999046. The cubic root of 205717065 is about 590.3235465655.

The spelling of 205717065 in words is "two hundred five million, seven hundred seventeen thousand, sixty-five".