204432661 has 4 divisors (see below), whose sum is σ = 206308300. Its totient is φ = 202557024.

The previous prime is 204432637. The next prime is 204432673. The reversal of 204432661 is 166234402.

204432661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 117831025 + 86601636 = 10855^2 + 9306^2 .

It is a cyclic number.

It is not a de Polignac number, because 204432661 - 2⁹ = 204432149 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 (204432061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 937656 + ... + 937873.

It is an arithmetic number, because the mean of its divisors is an integer number (51577075).

Almost surely, 2^204432661 is an apocalyptic number.

It is an amenable number.

204432661 is a deficient number, since it is larger than the sum of its proper divisors (1875639).

204432661 is a wasteful number, since it uses less digits than its factorization.

204432661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875638.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 204432661 is about 14297.9949992997. The cubic root of 204432661 is about 589.0924100009.

It can be divided in two parts, 20443 and 2661, that added together give a square (23104 = 152²).

The spelling of 204432661 in words is "two hundred four million, four hundred thirty-two thousand, six hundred sixty-one".