19140786689 has 4 divisors (see below), whose sum is σ = 19195631700. Its totient is φ = 19085941680.

The previous prime is 19140786677. The next prime is 19140786697. The reversal of 19140786689 is 98668704191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98668704191 = 17 ⋅5804041423.

It can be written as a sum of positive squares in 2 ways, for example, as 15899192464 + 3241594225 = 126092^2 + 56935^2 .

It is a cyclic number.

It is not a de Polignac number, because 19140786689 - 2⁴ = 19140786673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19140786619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27421982 + ... + 27422679.

It is an arithmetic number, because the mean of its divisors is an integer number (4798907925).

Almost surely, 2^19140786689 is an apocalyptic number.

It is an amenable number.

19140786689 is a deficient number, since it is larger than the sum of its proper divisors (54845011).

19140786689 is an equidigital number, since it uses as much as digits as its factorization.

19140786689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54845010.

The product of its (nonzero) digits is 5225472, while the sum is 59.

The spelling of 19140786689 in words is "nineteen billion, one hundred forty million, seven hundred eighty-six thousand, six hundred eighty-nine".