204001666 has 32 divisors (see below), whose sum is σ = 355363200. Its totient is φ = 86803200.

The previous prime is 204001663. The next prime is 204001687. The reversal of 204001666 is 666100402.

It is a happy number.

204001666 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 204001666.

It is not an unprimeable number, because it can be changed into a prime (204001663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73056 + ... + 75796.

It is an arithmetic number, because the mean of its divisors is an integer number (11105100).

Almost surely, 2^204001666 is an apocalyptic number.

204001666 is a deficient number, since it is larger than the sum of its proper divisors (151361534).

204001666 is a wasteful number, since it uses less digits than its factorization.

204001666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2970.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 204001666 is about 14282.9151786321. The cubic root of 204001666 is about 588.6781341923.

The spelling of 204001666 in words is "two hundred four million, one thousand, six hundred sixty-six".