15213705225625 has 15 divisors (see below), whose sum is σ = 19011167901561. Its totient is φ = 12170886171000.

The previous prime is 15213705225623. The next prime is 15213705225671. The reversal of 15213705225625 is 52652250731251.

The square root of 15213705225625 is 3900475.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1192754489689 + 14020950735936 = 1092133^2 + 3744456^2 .

It is not a de Polignac number, because 15213705225625 - 2¹ = 15213705225623 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15213705225623) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 97433866 + ... + 97589884.

Almost surely, 2^{15213705225625} is an apocalyptic number.

15213705225625 is the 3900475-th square number.

15213705225625 is the 1950238-th centered octagonal number.

It is an amenable number.

15213705225625 is a deficient number, since it is larger than the sum of its proper divisors (3797462675936).

15213705225625 is an frugal number, since it uses more digits than its factorization.

15213705225625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312058 (or 156024 counting only the distinct ones).

The product of its (nonzero) digits is 1260000, while the sum is 46.

Adding to 15213705225625 its reverse (52652250731251), we get a palindrome (67865955956876).

The spelling of 15213705225625 in words is "fifteen trillion, two hundred thirteen billion, seven hundred five million, two hundred twenty-five thousand, six hundred twenty-five".