204488434865 has 36 divisors (see below), whose sum is σ = 290526753972. Its totient is φ = 137252026560.

The previous prime is 204488434793. The next prime is 204488434867. The reversal of 204488434865 is 568434884402.

It can be written as a sum of positive squares in 2 ways, for example, as 50335614736 + 154152820129 = 224356^2 + 392623^2 .

It is not a de Polignac number, because 204488434865 - 2¹⁶ = 204488369329 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 204488434865.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204488434867) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 40101086 + ... + 40106184.

Almost surely, 2^204488434865 is an apocalyptic number.

It is an amenable number.

204488434865 is a deficient number, since it is larger than the sum of its proper divisors (86038319107).

204488434865 is an frugal number, since it uses more digits than its factorization.

204488434865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10238 (or 5128 counting only the distinct ones).

The product of its (nonzero) digits is 23592960, while the sum is 56.

The spelling of 204488434865 in words is "two hundred four billion, four hundred eighty-eight million, four hundred thirty-four thousand, eight hundred sixty-five".