15618750625 has 15 divisors (see below), whose sum is σ = 19521095781. Its totient is φ = 12492501000.

The previous prime is 15618750607. The next prime is 15618750647. The reversal of 15618750625 is 52605781651.

The square root of 15618750625 is 124975.

It is a perfect power (a square), and thus also a powerful number.

15618750625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1224510049 + 14394240576 = 34993^2 + 119976^2 .

It is a de Polignac number, because none of the positive numbers 2^k-15618750625 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 3121876 + ... + 3126874.

Almost surely, 2^15618750625 is an apocalyptic number.

15618750625 is the 124975-th square number.

15618750625 is the 62488-th centered octagonal number.

It is an amenable number.

15618750625 is a deficient number, since it is larger than the sum of its proper divisors (3902345156).

15618750625 is an frugal number, since it uses more digits than its factorization.

15618750625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10018 (or 5004 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 46.

The spelling of 15618750625 in words is "fifteen billion, six hundred eighteen million, seven hundred fifty thousand, six hundred twenty-five".