205042565 has 16 divisors (see below), whose sum is σ = 302832768. Its totient is φ = 129784896.

The previous prime is 205042553. The next prime is 205042571. The reversal of 205042565 is 565240502.

It is a cyclic number.

It is not a de Polignac number, because 205042565 - 2⁴ = 205042549 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224867 + ... + 225776.

It is an arithmetic number, because the mean of its divisors is an integer number (18927048).

Almost surely, 2^205042565 is an apocalyptic number.

It is an amenable number.

205042565 is a deficient number, since it is larger than the sum of its proper divisors (97790203).

205042565 is a wasteful number, since it uses less digits than its factorization.

205042565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450668.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 205042565 is about 14319.3074204027. The cubic root of 205042565 is about 589.6776607545.

The spelling of 205042565 in words is "two hundred five million, forty-two thousand, five hundred sixty-five".