15973168225 has 81 divisors (see below), whose sum is σ = 24240184857. Its totient is φ = 10410079680.

The previous prime is 15973168217. The next prime is 15973168259. The reversal of 15973168225 is 52286137951.

The square root of 15973168225 is 126385.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1931866209 + 14041302016 = 43953^2 + 118496^2 .

It is not a de Polignac number, because 15973168225 - 2³ = 15973168217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

Its product of digits (907200) is a multiple of the sum of its prime divisors (192).

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 101739847 + ... + 101740003.

Almost surely, 2^15973168225 is an apocalyptic number.

15973168225 is the 126385-th square number.

15973168225 is the 63193-rd centered octagonal number.

It is an amenable number.

15973168225 is a deficient number, since it is larger than the sum of its proper divisors (8267016632).

15973168225 is an equidigital number, since it uses as much as digits as its factorization.

15973168225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384 (or 192 counting only the distinct ones).

The product of its digits is 907200, while the sum is 49.

Multiplying 15973168225 by its sum of digits (49), we get a square (782685243025 = 884695²).

15973168225 divided by its sum of digits (49) gives a square (325983025 = 18055²).

The spelling of 15973168225 in words is "fifteen billion, nine hundred seventy-three million, one hundred sixty-eight thousand, two hundred twenty-five".