204136666 has 4 divisors (see below), whose sum is σ = 306205002. Its totient is φ = 102068332.

The previous prime is 204136619. The next prime is 204136693. The reversal of 204136666 is 666631402.

204136666 is digitally balanced in base 3, 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.

It can be written as a sum of positive squares in only one way, i.e., 139736041 + 64400625 = 11821^2 + 8025^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51034165 + ... + 51034168.

Almost surely, 2^204136666 is an apocalyptic number.

204136666 is a deficient number, since it is larger than the sum of its proper divisors (102068336).

204136666 is a wasteful number, since it uses less digits than its factorization.

204136666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102068335.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 204136666 is about 14287.6403230205. The cubic root of 204136666 is about 588.8079599690.

The spelling of 204136666 in words is "two hundred four million, one hundred thirty-six thousand, six hundred sixty-six".