205257085836 has 48 divisors (see below), whose sum is σ = 522547054848. Its totient is φ = 62190251200.

The previous prime is 205257085811. The next prime is 205257085837. The reversal of 205257085836 is 638580752502.

205257085836 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (205257085837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 850201 + ... + 1064591.

It is an arithmetic number, because the mean of its divisors is an integer number (10886396976).

Almost surely, 2^205257085836 is an apocalyptic number.

It is an amenable number.

205257085836 is an abundant number, since it is smaller than the sum of its proper divisors (317289969012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205257085836 is a wasteful number, since it uses less digits than its factorization.

205257085836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221662 (or 221660 counting only the distinct ones).

The product of its (nonzero) digits is 4032000, while the sum is 51.

The spelling of 205257085836 in words is "two hundred five billion, two hundred fifty-seven million, eighty-five thousand, eight hundred thirty-six".