561555625 has 20 divisors (see below), whose sum is σ = 703602900. Its totient is φ = 448040000.

The previous prime is 561555613. The next prime is 561555637. The reversal of 561555625 is 526555165.

It is an interprime number because it is at equal distance from previous prime (561555613) and next prime (561555637).

It can be written as a sum of positive squares in 10 ways, for example, as 395970201 + 165585424 = 19899^2 + 12868^2 .

It is not a de Polignac number, because 561555625 - 2⁵ = 561555593 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 287151 + ... + 289099.

It is an arithmetic number, because the mean of its divisors is an integer number (35180145).

Almost surely, 2^561555625 is an apocalyptic number.

It is an amenable number.

561555625 is a deficient number, since it is larger than the sum of its proper divisors (142047275).

561555625 is an equidigital number, since it uses as much as digits as its factorization.

561555625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430 (or 2415 counting only the distinct ones).

The product of its digits is 225000, while the sum is 40.

The square root of 561555625 is about 23697.1649148163. The cubic root of 561555625 is about 825.0195893726.

The spelling of 561555625 in words is "five hundred sixty-one million, five hundred fifty-five thousand, six hundred twenty-five".