18131295969 has 12 divisors (see below), whose sum is σ = 26459647396. Its totient is φ = 11962916352.

The previous prime is 18131295947. The next prime is 18131295977. The reversal of 18131295969 is 96959213181.

18131295969 is a `hidden beast` number, since 18 + 1 + 31 + 2 + 9 + 596 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14985432225 + 3145863744 = 122415^2 + 56088^2 .

It is not a de Polignac number, because 18131295969 - 2⁵ = 18131295937 is a prime.

It is a super-2 number, since 2×18131295969² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18131295569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10383604 + ... + 10385349.

Almost surely, 2^18131295969 is an apocalyptic number.

It is an amenable number.

18131295969 is a deficient number, since it is larger than the sum of its proper divisors (8328351427).

18131295969 is a wasteful number, since it uses less digits than its factorization.

18131295969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20769056 (or 20769053 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 54.

The spelling of 18131295969 in words is "eighteen billion, one hundred thirty-one million, two hundred ninety-five thousand, nine hundred sixty-nine".