204005666 has 8 divisors (see below), whose sum is σ = 306088860. Its totient is φ = 101976048.

The previous prime is 204005663. The next prime is 204005677. The reversal of 204005666 is 666500402.

It can be written as a sum of positive squares in 2 ways, for example, as 198105625 + 5900041 = 14075^2 + 2429^2 .

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

It is not an unprimeable number, because it can be changed into a prime (204005663) 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, 1901 + ... + 20288.

Almost surely, 2^204005666 is an apocalyptic number.

204005666 is a deficient number, since it is larger than the sum of its proper divisors (102083194).

204005666 is a wasteful number, since it uses less digits than its factorization.

204005666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26788.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 204005666 is about 14283.0552053824. The cubic root of 204005666 is about 588.6819817052.

The spelling of 204005666 in words is "two hundred four million, five thousand, six hundred sixty-six".