204425445661 has 4 divisors (see below), whose sum is σ = 204461690524. Its totient is φ = 204389200800.

The previous prime is 204425445589. The next prime is 204425445703. The reversal of 204425445661 is 166544524402.

204425445661 is digitally balanced in base 2, 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 2 ways, for example, as 124401522436 + 80023923225 = 352706^2 + 282885^2 .

It is a cyclic number.

It is not a de Polignac number, because 204425445661 - 2⁷ = 204425445533 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 (204425445061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18113970 + ... + 18125251.

It is an arithmetic number, because the mean of its divisors is an integer number (51115422631).

Almost surely, 2^204425445661 is an apocalyptic number.

It is an amenable number.

204425445661 is a deficient number, since it is larger than the sum of its proper divisors (36244863).

204425445661 is an equidigital number, since it uses as much as digits as its factorization.

204425445661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36244862.

The product of its (nonzero) digits is 921600, while the sum is 43.

The spelling of 204425445661 in words is "two hundred four billion, four hundred twenty-five million, four hundred forty-five thousand, six hundred sixty-one".