19986666716 has 48 divisors (see below), whose sum is σ = 37854311040. Its totient is φ = 9213012480.

The previous prime is 19986666701. The next prime is 19986666719. The reversal of 19986666716 is 61766668991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19986666719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178826 + ... + 268238.

It is an arithmetic number, because the mean of its divisors is an integer number (788631480).

Almost surely, 2^19986666716 is an apocalyptic number.

It is an amenable number.

19986666716 is a deficient number, since it is larger than the sum of its proper divisors (17867644324).

19986666716 is a wasteful number, since it uses less digits than its factorization.

19986666716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89534 (or 89532 counting only the distinct ones).

The product of its digits is 35271936, while the sum is 65.

The spelling of 19986666716 in words is "nineteen billion, nine hundred eighty-six million, six hundred sixty-six thousand, seven hundred sixteen".