205568065 has 4 divisors (see below), whose sum is σ = 246681684. Its totient is φ = 164454448.

The previous prime is 205568053. The next prime is 205568101. The reversal of 205568065 is 560865502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75881521 + 129686544 = 8711^2 + 11388^2 .

It is a cyclic number.

It is not a de Polignac number, because 205568065 - 2⁷ = 205567937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20556802 + ... + 20556811.

It is an arithmetic number, because the mean of its divisors is an integer number (61670421).

Almost surely, 2^205568065 is an apocalyptic number.

It is an amenable number.

205568065 is a deficient number, since it is larger than the sum of its proper divisors (41113619).

205568065 is an equidigital number, since it uses as much as digits as its factorization.

205568065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41113618.

The product of its (nonzero) digits is 72000, while the sum is 37.

The square root of 205568065 is about 14337.6450297809. The cubic root of 205568065 is about 590.1809891928.

The spelling of 205568065 in words is "two hundred five million, five hundred sixty-eight thousand, sixty-five".