19664736916 has 48 divisors (see below), whose sum is σ = 38608073280. Its totient is φ = 8687793920.

The previous prime is 19664736913. The next prime is 19664736929. The reversal of 19664736916 is 61963746691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19664736913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210120 + ... + 288928.

It is an arithmetic number, because the mean of its divisors is an integer number (804334860).

Almost surely, 2^19664736916 is an apocalyptic number.

It is an amenable number.

19664736916 is a deficient number, since it is larger than the sum of its proper divisors (18943336364).

19664736916 is a wasteful number, since it uses less digits than its factorization.

19664736916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78984 (or 78982 counting only the distinct ones).

The product of its digits is 8817984, while the sum is 58.

The spelling of 19664736916 in words is "nineteen billion, six hundred sixty-four million, seven hundred thirty-six thousand, nine hundred sixteen".