204166645 has 4 divisors (see below), whose sum is σ = 244999980. Its totient is φ = 163333312.

The previous prime is 204166643. The next prime is 204166661. The reversal of 204166645 is 546661402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55741156 + 148425489 = 7466^2 + 12183^2 .

It is a cyclic number.

It is not a de Polignac number, because 204166645 - 2¹ = 204166643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204166645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204166643) 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, 20416660 + ... + 20416669.

It is an arithmetic number, because the mean of its divisors is an integer number (61249995).

Almost surely, 2^204166645 is an apocalyptic number.

It is an amenable number.

204166645 is a deficient number, since it is larger than the sum of its proper divisors (40833335).

204166645 is an equidigital number, since it uses as much as digits as its factorization.

204166645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40833334.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 204166645 is about 14288.6894080598. The cubic root of 204166645 is about 588.8367821794.

It can be divided in two parts, 2041 and 66645, that added together give a palindrome (68686).

The spelling of 204166645 in words is "two hundred four million, one hundred sixty-six thousand, six hundred forty-five".