19391825068225 has 9 divisors (see below), whose sum is σ = 24045890387043. Its totient is φ = 15513442440120.

The previous prime is 19391825068163. The next prime is 19391825068237. The reversal of 19391825068225 is 52286052819391.

The square root of 19391825068225 is 4403615.

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

It can be written as a sum of positive squares in only one way, i.e., 6981057024561 + 12410768043664 = 2642169^2 + 3522892^2 .

It is not a de Polignac number, because 19391825068225 - 2¹³ = 19391825060033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 21577714 + ... + 22458436.

Almost surely, 2^{19391825068225} is an apocalyptic number.

19391825068225 is the 4403615-th square number.

19391825068225 is the 2201808-th centered octagonal number.

It is an amenable number.

19391825068225 is a deficient number, since it is larger than the sum of its proper divisors (4654065318818).

19391825068225 is an frugal number, since it uses more digits than its factorization.

19391825068225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1761456 (or 880728 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 61.

The spelling of 19391825068225 in words is "nineteen trillion, three hundred ninety-one billion, eight hundred twenty-five million, sixty-eight thousand, two hundred twenty-five".