19811125504 has 81 divisors (see below), whose sum is σ = 41826051603. Its totient is φ = 9363949056.

The previous prime is 19811125493. The next prime is 19811125517. The reversal of 19811125504 is 40552111891.

It is a happy number.

The square root of 19811125504 is 140752.

It is a perfect power (a square), and thus also a powerful 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, 42788377 + ... + 42788839.

Almost surely, 2^19811125504 is an apocalyptic number.

19811125504 is the 140752-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19811125504

19811125504 is an abundant number, since it is smaller than the sum of its proper divisors (22014926099).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19811125504 is an frugal number, since it uses more digits than its factorization.

19811125504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 37.

Multiplying 19811125504 by its product of nonzero digits (14400), we get a square (285280207257600 = 16890240²).

The spelling of 19811125504 in words is "nineteen billion, eight hundred eleven million, one hundred twenty-five thousand, five hundred four".