19999681696 has 48 divisors (see below), whose sum is σ = 39522095424. Its totient is φ = 9962412544.

The previous prime is 19999681693. The next prime is 19999681697. The reversal of 19999681696 is 69618699991.

It is not an unprimeable number, because it can be changed into a prime (19999681693) by changing a digit.

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, 13955796 + ... + 13957228.

It is an arithmetic number, because the mean of its divisors is an integer number (823376988).

Almost surely, 2^19999681696 is an apocalyptic number.

19999681696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19999681696 is a deficient number, since it is larger than the sum of its proper divisors (19522413728).

19999681696 is a wasteful number, since it uses less digits than its factorization.

19999681696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2773 (or 2765 counting only the distinct ones).

The product of its digits is 102036672, while the sum is 73.

The spelling of 19999681696 in words is "nineteen billion, nine hundred ninety-nine million, six hundred eighty-one thousand, six hundred ninety-six".