204345665 has 8 divisors (see below), whose sum is σ = 258120960. Its totient is φ = 154872432.

The previous prime is 204345643. The next prime is 204345677. The reversal of 204345665 is 566543402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 204345665 - 2¹⁶ = 204280129 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1075409 + ... + 1075598.

It is an arithmetic number, because the mean of its divisors is an integer number (32265120).

Almost surely, 2^204345665 is an apocalyptic number.

It is an amenable number.

204345665 is a deficient number, since it is larger than the sum of its proper divisors (53775295).

204345665 is a wasteful number, since it uses less digits than its factorization.

204345665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2151031.

The product of its (nonzero) digits is 86400, while the sum is 35.

The square root of 204345665 is about 14294.9524308408. The cubic root of 204345665 is about 589.0088356927.

The spelling of 204345665 in words is "two hundred four million, three hundred forty-five thousand, six hundred sixty-five".