25561560125 has 16 divisors (see below), whose sum is σ = 31925550384. Its totient is φ = 20433400000.

The previous prime is 25561560121. The next prime is 25561560173. The reversal of 25561560125 is 52106516552.

It can be written as a sum of positive squares in 8 ways, for example, as 9902041081 + 15659519044 = 99509^2 + 125138^2 .

It is not a de Polignac number, because 25561560125 - 2² = 25561560121 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 (25561560121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84035 + ... + 241215.

It is an arithmetic number, because the mean of its divisors is an integer number (1995346899).

Almost surely, 2^25561560125 is an apocalyptic number.

25561560125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25561560125 is a deficient number, since it is larger than the sum of its proper divisors (6363990259).

25561560125 is a wasteful number, since it uses less digits than its factorization.

25561560125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158497 (or 158487 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 38.

The spelling of 25561560125 in words is "twenty-five billion, five hundred sixty-one million, five hundred sixty thousand, one hundred twenty-five".