204290440225 has 9 divisors (see below), whose sum is σ = 253322948217. Its totient is φ = 163430544240.

The previous prime is 204290440187. The next prime is 204290440243. The reversal of 204290440225 is 522044092402.

The square root of 204290440225 is 451985.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 118567969569 + 85722470656 = 344337^2 + 292784^2 .

It is not a de Polignac number, because 204290440225 - 2⁷ = 204290440097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2214727 + ... + 2305123.

Almost surely, 2^204290440225 is an apocalyptic number.

204290440225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

204290440225 is the 451985-th square number.

204290440225 is the 225993-rd centered octagonal number.

It is an amenable number.

204290440225 is a deficient number, since it is larger than the sum of its proper divisors (49032507992).

204290440225 is an frugal number, since it uses more digits than its factorization.

204290440225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180804 (or 90402 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 34.

The spelling of 204290440225 in words is "two hundred four billion, two hundred ninety million, four hundred forty thousand, two hundred twenty-five".