19664410688 has 28 divisors (see below), whose sum is σ = 42023225580. Its totient is φ = 9075881472.

The previous prime is 19664410657. The next prime is 19664410709. The reversal of 19664410688 is 88601446691.

It can be written as a sum of positive squares in 2 ways, for example, as 2459366464 + 17205044224 = 49592^2 + 131168^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11816723 + ... + 11818386.

It is an arithmetic number, because the mean of its divisors is an integer number (1500829485).

Almost surely, 2^19664410688 is an apocalyptic number.

It is an amenable number.

19664410688 is an abundant number, since it is smaller than the sum of its proper divisors (22358814892).

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

19664410688 is a wasteful number, since it uses less digits than its factorization.

19664410688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23635134 (or 23635124 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 53.

The spelling of 19664410688 in words is "nineteen billion, six hundred sixty-four million, four hundred ten thousand, six hundred eighty-eight".