19717644272 has 40 divisors (see below), whose sum is σ = 40265994240. Its totient is φ = 9339249920.

The previous prime is 19717644227. The next prime is 19717644277. The reversal of 19717644272 is 27244671791.

It is a self number, because there is not a number n which added to its sum of digits gives 19717644272.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19717644277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376304 + ... + 425487.

It is an arithmetic number, because the mean of its divisors is an integer number (1006649856).

Almost surely, 2^19717644272 is an apocalyptic number.

It is an amenable number.

19717644272 is an abundant number, since it is smaller than the sum of its proper divisors (20548349968).

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

19717644272 is a wasteful number, since it uses less digits than its factorization.

19717644272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801881 (or 801875 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 50.

The spelling of 19717644272 in words is "nineteen billion, seven hundred seventeen million, six hundred forty-four thousand, two hundred seventy-two".