19789498791 has 24 divisors (see below), whose sum is σ = 29090309040. Its totient is φ = 12961593216.

The previous prime is 19789498787. The next prime is 19789498801.

19789498791 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 19789498791 - 2² = 19789498787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19789498721) 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 23 ways as a sum of consecutive naturals, for example, 47076 + ... + 204438.

It is an arithmetic number, because the mean of its divisors is an integer number (1212096210).

Almost surely, 2^19789498791 is an apocalyptic number.

19789498791 is a deficient number, since it is larger than the sum of its proper divisors (9300810249).

19789498791 is a wasteful number, since it uses less digits than its factorization.

19789498791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157615 (or 157612 counting only the distinct ones).

The product of its digits is 82301184, while the sum is 72.

The spelling of 19789498791 in words is "nineteen billion, seven hundred eighty-nine million, four hundred ninety-eight thousand, seven hundred ninety-one".