19889315664 has 40 divisors (see below), whose sum is σ = 52769405280. Its totient is φ = 6450588288.

The previous prime is 19889315639. The next prime is 19889315669. The reversal of 19889315664 is 46651398891.

It is a junction number, because it is equal to n+sod(n) for n = 19889315598 and 19889315607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19889315669) 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, 5597694 + ... + 5601245.

It is an arithmetic number, because the mean of its divisors is an integer number (1319235132).

Almost surely, 2^19889315664 is an apocalyptic number.

It is an amenable number.

19889315664 is an abundant number, since it is smaller than the sum of its proper divisors (32880089616).

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

19889315664 is a wasteful number, since it uses less digits than its factorization.

19889315664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11198987 (or 11198981 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 60.

The spelling of 19889315664 in words is "nineteen billion, eight hundred eighty-nine million, three hundred fifteen thousand, six hundred sixty-four".