204525661 has 4 divisors (see below), whose sum is σ = 211578300. Its totient is φ = 197473024.

The previous prime is 204525641. The next prime is 204525667. The reversal of 204525661 is 166525402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166525402 = 2 ⋅83262701.

It can be written as a sum of positive squares in 2 ways, for example, as 74132100 + 130393561 = 8610^2 + 11419^2 .

It is a cyclic number.

It is not a de Polignac number, because 204525661 - 2⁷ = 204525533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204525667) 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, 3526276 + ... + 3526333.

It is an arithmetic number, because the mean of its divisors is an integer number (52894575).

Almost surely, 2^204525661 is an apocalyptic number.

It is an amenable number.

204525661 is a deficient number, since it is larger than the sum of its proper divisors (7052639).

204525661 is an equidigital number, since it uses as much as digits as its factorization.

204525661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7052638.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 204525661 is about 14301.2468337554. The cubic root of 204525661 is about 589.1817259453.

The spelling of 204525661 in words is "two hundred four million, five hundred twenty-five thousand, six hundred sixty-one".