15625661712125 has 64 divisors (see below), whose sum is σ = 19658003182272. Its totient is φ = 12400312320000.

The previous prime is 15625661712121. The next prime is 15625661712187. The reversal of 15625661712125 is 52121716652651.

It can be written as a sum of positive squares in 32 ways, for example, as 8068627724089 + 7557033988036 = 2840533^2 + 2749006^2 .

It is not a de Polignac number, because 15625661712125 - 2² = 15625661712121 is a prime.

It is a super-2 number, since 2×15625661712125² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15625661712121) 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 63 ways as a sum of consecutive naturals, for example, 10754067899 + ... + 10754069351.

It is an arithmetic number, because the mean of its divisors is an integer number (307156299723).

Almost surely, 2^{15625661712125} is an apocalyptic number.

It is an amenable number.

15625661712125 is a deficient number, since it is larger than the sum of its proper divisors (4032341470147).

15625661712125 is a wasteful number, since it uses less digits than its factorization.

15625661712125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2883 (or 2873 counting only the distinct ones).

The product of its digits is 1512000, while the sum is 50.

The spelling of 15625661712125 in words is "fifteen trillion, six hundred twenty-five billion, six hundred sixty-one million, seven hundred twelve thousand, one hundred twenty-five".