16196380225 has 9 divisors (see below), whose sum is σ = 20084300553. Its totient is φ = 12956595120.

The previous prime is 16196380181. The next prime is 16196380229. The reversal of 16196380225 is 52208369161.

The square root of 16196380225 is 127265.

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 384826689 + 15811553536 = 19617^2 + 125744^2 .

It is not a de Polignac number, because 16196380225 - 2⁹ = 16196379713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16196380229) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 623599 + ... + 649051.

Almost surely, 2^16196380225 is an apocalyptic number.

16196380225 is the 127265-th square number.

16196380225 is the 63633-rd centered octagonal number.

It is an amenable number.

16196380225 is a deficient number, since it is larger than the sum of its proper divisors (3887920328).

16196380225 is an frugal number, since it uses more digits than its factorization.

16196380225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50916 (or 25458 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 16196380225 in words is "sixteen billion, one hundred ninety-six million, three hundred eighty thousand, two hundred twenty-five".