19523221168 has 80 divisors (see below), whose sum is σ = 42908682240. Its totient is φ = 8524915200.

The previous prime is 19523221147. The next prime is 19523221219. The reversal of 19523221168 is 86112232591.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19523221168.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 734413 + ... + 760531.

It is an arithmetic number, because the mean of its divisors is an integer number (536358528).

Almost surely, 2^19523221168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19523221168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21454341120).

19523221168 is an abundant number, since it is smaller than the sum of its proper divisors (23385461072).

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

19523221168 is a wasteful number, since it uses less digits than its factorization.

19523221168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26306 (or 26300 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The spelling of 19523221168 in words is "nineteen billion, five hundred twenty-three million, two hundred twenty-one thousand, one hundred sixty-eight".