15869140625 has 28 divisors (see below), whose sum is σ = 21362304684. Its totient is φ = 11718750000.

The previous prime is 15869140621. The next prime is 15869140631. The reversal of 15869140625 is 52604196851.

It can be written as a sum of positive squares in 14 ways, for example, as 14180999056 + 1688141569 = 119084^2 + 41087^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=13, B=5.

It is not a de Polignac number, because 15869140625 - 2² = 15869140621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15869140625.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15869140621) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1220703119 + ... + 1220703131.

It is an arithmetic number, because the mean of its divisors is an integer number (762939453).

Almost surely, 2^15869140625 is an apocalyptic number.

It is an amenable number.

15869140625 is a deficient number, since it is larger than the sum of its proper divisors (5493164059).

15869140625 is an frugal number, since it uses more digits than its factorization.

15869140625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 18 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 15869140625 in words is "fifteen billion, eight hundred sixty-nine million, one hundred forty thousand, six hundred twenty-five".