205042542565 has 48 divisors (see below), whose sum is σ = 301746961152. Its totient is φ = 133100706816.

The previous prime is 205042542547. The next prime is 205042542599. The reversal of 205042542565 is 565245240502.

It is not a de Polignac number, because 205042542565 - 2⁹ = 205042542053 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 359032 + ... + 734158.

It is an arithmetic number, because the mean of its divisors is an integer number (6286395024).

Almost surely, 2^205042542565 is an apocalyptic number.

It is an amenable number.

205042542565 is a deficient number, since it is larger than the sum of its proper divisors (96704418587).

205042542565 is a wasteful number, since it uses less digits than its factorization.

205042542565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375266 (or 375259 counting only the distinct ones).

The product of its (nonzero) digits is 480000, while the sum is 40.

The spelling of 205042542565 in words is "two hundred five billion, forty-two million, five hundred forty-two thousand, five hundred sixty-five".