205115565 has 32 divisors (see below), whose sum is σ = 340122240. Its totient is φ = 105487616.

The previous prime is 205115551. The next prime is 205115569. The reversal of 205115565 is 565511502.

205115565 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 205115565 - 2⁴ = 205115549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205115569) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44719 + ... + 49091.

It is an arithmetic number, because the mean of its divisors is an integer number (10628820).

Almost surely, 2^205115565 is an apocalyptic number.

It is an amenable number.

205115565 is a deficient number, since it is larger than the sum of its proper divisors (135006675).

205115565 is a wasteful number, since it uses less digits than its factorization.

205115565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4493.

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 205115565 is about 14321.8561995294. The cubic root of 205115565 is about 589.7476321801.

The spelling of 205115565 in words is "two hundred five million, one hundred fifteen thousand, five hundred sixty-five".