19017782807 has 4 divisors (see below), whose sum is σ = 19097355360. Its totient is φ = 18938210256.

The previous prime is 19017782789. The next prime is 19017782831. The reversal of 19017782807 is 70828771091.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19017782807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19017782837) 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 3 ways as a sum of consecutive naturals, for example, 39785918 + ... + 39786395.

It is an arithmetic number, because the mean of its divisors is an integer number (4774338840).

Almost surely, 2^19017782807 is an apocalyptic number.

19017782807 is a deficient number, since it is larger than the sum of its proper divisors (79572553).

19017782807 is an equidigital number, since it uses as much as digits as its factorization.

19017782807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79572552.

The product of its (nonzero) digits is 395136, while the sum is 50.

The spelling of 19017782807 in words is "nineteen billion, seventeen million, seven hundred eighty-two thousand, eight hundred seven".