204413661 has 12 divisors (see below), whose sum is σ = 312632892. Its totient is φ = 128259456.

The previous prime is 204413639. The next prime is 204413681. The reversal of 204413661 is 166314402.

It can be written as a sum of positive squares in 2 ways, for example, as 182088036 + 22325625 = 13494^2 + 4725^2 .

It is not a de Polignac number, because 204413661 - 2⁹ = 204413149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204413621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 667866 + ... + 668171.

It is an arithmetic number, because the mean of its divisors is an integer number (26052741).

Almost surely, 2^204413661 is an apocalyptic number.

It is an amenable number.

204413661 is a deficient number, since it is larger than the sum of its proper divisors (108219231).

204413661 is a wasteful number, since it uses less digits than its factorization.

204413661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336060 (or 1336057 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 204413661 is about 14297.3305550372. The cubic root of 204413661 is about 589.0741593252.

The spelling of 204413661 in words is "two hundred four million, four hundred thirteen thousand, six hundred sixty-one".