204040666 has 8 divisors (see below), whose sum is σ = 306558900. Its totient is φ = 101854368.

The previous prime is 204040649. The next prime is 204040673. The reversal of 204040666 is 666040402.

204040666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 165662641 + 38378025 = 12871^2 + 6195^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81441 + ... + 83908.

Almost surely, 2^204040666 is an apocalyptic number.

204040666 is a deficient number, since it is larger than the sum of its proper divisors (102518234).

204040666 is a wasteful number, since it uses less digits than its factorization.

204040666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165968.

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

The square root of 204040666 is about 14284.2803808942. The cubic root of 204040666 is about 588.7156452983.

The spelling of 204040666 in words is "two hundred four million, forty thousand, six hundred sixty-six".