19891064936 has 32 divisors (see below), whose sum is σ = 39225254400. Its totient is φ = 9443104320.

The previous prime is 19891064911. The next prime is 19891065011. The reversal of 19891064936 is 63946019891.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 743516 + ... + 769803.

It is an arithmetic number, because the mean of its divisors is an integer number (1225789200).

Almost surely, 2^19891064936 is an apocalyptic number.

It is an amenable number.

19891064936 is a deficient number, since it is larger than the sum of its proper divisors (19334189464).

19891064936 is a wasteful number, since it uses less digits than its factorization.

19891064936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513409 (or 1513405 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 56.

The spelling of 19891064936 in words is "nineteen billion, eight hundred ninety-one million, sixty-four thousand, nine hundred thirty-six".