204053661 has 40 divisors (see below), whose sum is σ = 350036544. Its totient is φ = 116523360.

The previous prime is 204053651. The next prime is 204053693. The reversal of 204053661 is 166350402.

204053661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 204053661 - 2⁹ = 204053149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204053611) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 137041 + ... + 138521.

Almost surely, 2^204053661 is an apocalyptic number.

204053661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

204053661 is a deficient number, since it is larger than the sum of its proper divisors (145982883).

204053661 is an frugal number, since it uses more digits than its factorization.

204053661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515 (or 1491 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 204053661 is about 14284.7352443089. The cubic root of 204053661 is about 588.7281431295.

The spelling of 204053661 in words is "two hundred four million, fifty-three thousand, six hundred sixty-one".