204665641 has 4 divisors (see below), whose sum is σ = 206578512. Its totient is φ = 202752772.

The previous prime is 204665639. The next prime is 204665653. The reversal of 204665641 is 146566402.

204665641 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 146566402 = 2 ⋅73283201.

It is a cyclic number.

It is not a de Polignac number, because 204665641 - 2¹ = 204665639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204665597 and 204665606.

It is not an unprimeable number, because it can be changed into a prime (204665621) 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, 956275 + ... + 956488.

It is an arithmetic number, because the mean of its divisors is an integer number (51644628).

Almost surely, 2^204665641 is an apocalyptic number.

It is an amenable number.

204665641 is a deficient number, since it is larger than the sum of its proper divisors (1912871).

204665641 is a wasteful number, since it uses less digits than its factorization.

204665641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1912870.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 204665641 is about 14306.1399755490. The cubic root of 204665641 is about 589.3161098158.

The spelling of 204665641 in words is "two hundred four million, six hundred sixty-five thousand, six hundred forty-one".