204163668 has 18 divisors (see below), whose sum is σ = 516080474. Its totient is φ = 68054544.

The previous prime is 204163667. The next prime is 204163703. The reversal of 204163668 is 866361402.

It can be written as a sum of positive squares in only one way, i.e., 177102864 + 27060804 = 13308^2 + 5202^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 5671213 = 204163668 / (2 + 0 + 4 + 1 + 6 + 3 + 6 + 6 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204163667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2835571 + ... + 2835642.

Almost surely, 2^204163668 is an apocalyptic number.

It is an amenable number.

204163668 is an abundant number, since it is smaller than the sum of its proper divisors (311916806).

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

204163668 is a wasteful number, since it uses less digits than its factorization.

204163668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5671223 (or 5671218 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 204163668 is about 14288.5852343750. The cubic root of 204163668 is about 588.8339201781.

The spelling of 204163668 in words is "two hundred four million, one hundred sixty-three thousand, six hundred sixty-eight".