204508253885 has 16 divisors (see below), whose sum is σ = 271430500656. Its totient is φ = 146939816448.

The previous prime is 204508253881. The next prime is 204508253903. The reversal of 204508253885 is 588352805402.

It can be written as a sum of positive squares in 8 ways, for example, as 28386184324 + 176122069561 = 168482^2 + 419669^2 .

It is a cyclic number.

It is not a de Polignac number, because 204508253885 - 2² = 204508253881 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204508253881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42514904 + ... + 42519713.

It is an arithmetic number, because the mean of its divisors is an integer number (16964406291).

Almost surely, 2^204508253885 is an apocalyptic number.

It is an amenable number.

204508253885 is a deficient number, since it is larger than the sum of its proper divisors (66922246771).

204508253885 is a wasteful number, since it uses less digits than its factorization.

204508253885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85034672.

The product of its (nonzero) digits is 3072000, while the sum is 50.

The spelling of 204508253885 in words is "two hundred four billion, five hundred eight million, two hundred fifty-three thousand, eight hundred eighty-five".