12725245561 has 6 divisors (see below), whose sum is σ = 14802836730. Its totient is φ = 10907353296.

The previous prime is 12725245537. The next prime is 12725245567. The reversal of 12725245561 is 16554252721.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11833088400 + 892157161 = 108780^2 + 29869^2 .

It is not a de Polignac number, because 12725245561 - 2⁵ = 12725245529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12725245567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 129849396 + ... + 129849493.

It is an arithmetic number, because the mean of its divisors is an integer number (2467139455).

Almost surely, 2^12725245561 is an apocalyptic number.

It is an amenable number.

12725245561 is a deficient number, since it is larger than the sum of its proper divisors (2077591169).

12725245561 is an equidigital number, since it uses as much as digits as its factorization.

12725245561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259698903 (or 259698896 counting only the distinct ones).

The product of its digits is 168000, while the sum is 40.

The spelling of 12725245561 in words is "twelve billion, seven hundred twenty-five million, two hundred forty-five thousand, five hundred sixty-one".