205168865 has 32 divisors (see below), whose sum is σ = 276756480. Its totient is φ = 144734400.

The previous prime is 205168853. The next prime is 205168889. The reversal of 205168865 is 568861502.

It is not a de Polignac number, because 205168865 - 2¹⁰ = 205167841 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 359030 + ... + 359600.

It is an arithmetic number, because the mean of its divisors is an integer number (8648640).

Almost surely, 2^205168865 is an apocalyptic number.

It is an amenable number.

205168865 is a deficient number, since it is larger than the sum of its proper divisors (71587615).

205168865 is a wasteful number, since it uses less digits than its factorization.

205168865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773.

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 205168865 is about 14323.7168709801. The cubic root of 205168865 is about 589.7987104206.

The spelling of 205168865 in words is "two hundred five million, one hundred sixty-eight thousand, eight hundred sixty-five".