19691789687 has 8 divisors (see below), whose sum is σ = 20565381600. Its totient is φ = 18819650080.

The previous prime is 19691789659. The next prime is 19691789701. The reversal of 19691789687 is 78698719691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19691789687 - 2¹² = 19691785591 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19691789687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19691789627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335312 + ... + 389637.

It is an arithmetic number, because the mean of its divisors is an integer number (2570672700).

Almost surely, 2^19691789687 is an apocalyptic number.

19691789687 is a deficient number, since it is larger than the sum of its proper divisors (873591913).

19691789687 is a wasteful number, since it uses less digits than its factorization.

19691789687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726153.

The product of its digits is 82301184, while the sum is 71.

The spelling of 19691789687 in words is "nineteen billion, six hundred ninety-one million, seven hundred eighty-nine thousand, six hundred eighty-seven".