15561027125 has 16 divisors (see below), whose sum is σ = 22194471936. Its totient is φ = 10670418000.

The previous prime is 15561027121. The next prime is 15561027149. The reversal of 15561027125 is 52172016551.

It is not a de Polignac number, because 15561027125 - 2² = 15561027121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15561027121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8891141 + ... + 8892890.

It is an arithmetic number, because the mean of its divisors is an integer number (1387154496).

Almost surely, 2^15561027125 is an apocalyptic number.

It is an amenable number.

15561027125 is a deficient number, since it is larger than the sum of its proper divisors (6633444811).

15561027125 is an equidigital number, since it uses as much as digits as its factorization.

15561027125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17784053 (or 17784043 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 35.

The spelling of 15561027125 in words is "fifteen billion, five hundred sixty-one million, twenty-seven thousand, one hundred twenty-five".