18263931338 has 8 divisors (see below), whose sum is σ = 27547256100. Its totient is φ = 9081512640.

The previous prime is 18263931337. The next prime is 18263931349. The reversal of 18263931338 is 83313936281.

It can be written as a sum of positive squares in 2 ways, for example, as 18253901449 + 10029889 = 135107^2 + 3167^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 18263931292 and 18263931301.

It is not an unprimeable number, because it can be changed into a prime (18263931337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25226063 + ... + 25226786.

Almost surely, 2^18263931338 is an apocalyptic number.

18263931338 is a deficient number, since it is larger than the sum of its proper divisors (9283324762).

18263931338 is a wasteful number, since it uses less digits than its factorization.

18263931338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50453032.

The product of its digits is 559872, while the sum is 47.

The spelling of 18263931338 in words is "eighteen billion, two hundred sixty-three million, nine hundred thirty-one thousand, three hundred thirty-eight".