206569090565 has 4 divisors (see below), whose sum is σ = 247882908684. Its totient is φ = 165255272448.

The previous prime is 206569090549. The next prime is 206569090579. The reversal of 206569090565 is 565090965602.

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 105255473761 + 101313616804 = 324431^2 + 318298^2 .

It is a cyclic number.

It is not a de Polignac number, because 206569090565 - 2⁴ = 206569090549 is a prime.

It is a Duffinian number.

It is a congruent 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, 20656909052 + ... + 20656909061.

It is an arithmetic number, because the mean of its divisors is an integer number (61970727171).

Almost surely, 2^206569090565 is an apocalyptic number.

It is an amenable number.

206569090565 is a deficient number, since it is larger than the sum of its proper divisors (41313818119).

206569090565 is an equidigital number, since it uses as much as digits as its factorization.

206569090565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41313818118.

The product of its (nonzero) digits is 4374000, while the sum is 53.

The spelling of 206569090565 in words is "two hundred six billion, five hundred sixty-nine million, ninety thousand, five hundred sixty-five".