18311319442 has 16 divisors (see below), whose sum is σ = 29795740632. Its totient is φ = 8389687680.

The previous prime is 18311319419. The next prime is 18311319443. The reversal of 18311319442 is 24491311381.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13316929201 + 4994390241 = 115399^2 + 70671^2 .

It is not an unprimeable number, because it can be changed into a prime (18311319443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2566809 + ... + 2573932.

Almost surely, 2^18311319442 is an apocalyptic number.

18311319442 is a deficient number, since it is larger than the sum of its proper divisors (11484421190).

18311319442 is a wasteful number, since it uses less digits than its factorization.

18311319442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5140893.

The product of its digits is 20736, while the sum is 37.

The spelling of 18311319442 in words is "eighteen billion, three hundred eleven million, three hundred nineteen thousand, four hundred forty-two".