19688888691 has 12 divisors (see below), whose sum is σ = 30112418232. Its totient is φ = 12353812416.

The previous prime is 19688888663. The next prime is 19688888701.

It is a happy number.

19688888691 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 19688888691 - 2⁶ = 19688888627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19688880691) 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 11 ways as a sum of consecutive naturals, for example, 64342621 + ... + 64342926.

It is an arithmetic number, because the mean of its divisors is an integer number (2509368186).

Almost surely, 2^19688888691 is an apocalyptic number.

19688888691 is a deficient number, since it is larger than the sum of its proper divisors (10423529541).

19688888691 is a wasteful number, since it uses less digits than its factorization.

19688888691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128685570 (or 128685567 counting only the distinct ones).

The product of its digits is 95551488, while the sum is 72.

The spelling of 19688888691 in words is "nineteen billion, six hundred eighty-eight million, eight hundred eighty-eight thousand, six hundred ninety-one".