15827149372225 has 9 divisors (see below), whose sum is σ = 19625689887267. Its totient is φ = 12661703584440.

The previous prime is 15827149372219. The next prime is 15827149372231. The reversal of 15827149372225 is 52227394172851.

The square root of 15827149372225 is 3978335.

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

It is an interprime number because it is at equal distance from previous prime (15827149372219) and next prime (15827149372231).

It can be written as a sum of positive squares in only one way, i.e., 5697773774001 + 10129375598224 = 2387001^2 + 3182668^2 .

It is not a de Polignac number, because 15827149372225 - 2³³ = 15818559437633 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 15827149372225.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 19493842 + ... + 20289508.

Almost surely, 2^{15827149372225} is an apocalyptic number.

15827149372225 is the 3978335-th square number.

15827149372225 is the 1989168-th centered octagonal number.

It is an amenable number.

15827149372225 is a deficient number, since it is larger than the sum of its proper divisors (3798540515042).

15827149372225 is an frugal number, since it uses more digits than its factorization.

15827149372225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591344 (or 795672 counting only the distinct ones).

The product of its digits is 16934400, while the sum is 58.

The spelling of 15827149372225 in words is "fifteen trillion, eight hundred twenty-seven billion, one hundred forty-nine million, three hundred seventy-two thousand, two hundred twenty-five".