19686868691 has 4 divisors (see below), whose sum is σ = 22499278512. Its totient is φ = 16874458872.

The previous prime is 19686868657. The next prime is 19686868697.

19686868691 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19686868691 - 2¹⁰ = 19686867667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19686868697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1406204900 + ... + 1406204913.

It is an arithmetic number, because the mean of its divisors is an integer number (5624819628).

Almost surely, 2^19686868691 is an apocalyptic number.

19686868691 is a deficient number, since it is larger than the sum of its proper divisors (2812409821).

19686868691 is an equidigital number, since it uses as much as digits as its factorization.

19686868691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2812409820.

The product of its digits is 53747712, while the sum is 68.

The spelling of 19686868691 in words is "nineteen billion, six hundred eighty-six million, eight hundred sixty-eight thousand, six hundred ninety-one".