791179018209 has 6 divisors (see below), whose sum is σ = 1142814137426. Its totient is φ = 527452678800.

The previous prime is 791179018207. The next prime is 791179018213. The reversal of 791179018209 is 902810971197.

It can be written as a sum of positive squares in only one way, i.e., 528379248609 + 262799769600 = 726897^2 + 512640^2 .

It is not a de Polignac number, because 791179018209 - 2¹ = 791179018207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (791179018207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43954389892 + ... + 43954389909.

Almost surely, 2^791179018209 is an apocalyptic number.

It is an amenable number.

791179018209 is a deficient number, since it is larger than the sum of its proper divisors (351635119217).

791179018209 is a wasteful number, since it uses less digits than its factorization.

791179018209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87908779807 (or 87908779804 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 54.

The spelling of 791179018209 in words is "seven hundred ninety-one billion, one hundred seventy-nine million, eighteen thousand, two hundred nine".