205516225 has 6 divisors (see below), whose sum is σ = 254840150. Its totient is φ = 164412960.

The previous prime is 205516211. The next prime is 205516229. The reversal of 205516225 is 522615502.

It can be written as a sum of positive squares in 3 ways, for example, as 15186609 + 190329616 = 3897^2 + 13796^2 .

It is not a de Polignac number, because 205516225 - 2⁵ = 205516193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205516193 and 205516202.

It is not an unprimeable number, because it can be changed into a prime (205516229) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 4110300 + ... + 4110349.

Almost surely, 2^205516225 is an apocalyptic number.

205516225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

205516225 is a deficient number, since it is larger than the sum of its proper divisors (49323925).

205516225 is an equidigital number, since it uses as much as digits as its factorization.

205516225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8220659 (or 8220654 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 205516225 is about 14335.8370875230. The cubic root of 205516225 is about 590.1313745560.

The spelling of 205516225 in words is "two hundred five million, five hundred sixteen thousand, two hundred twenty-five".