18011109436 has 6 divisors (see below), whose sum is σ = 31519441520. Its totient is φ = 9005554716.

The previous prime is 18011109401. The next prime is 18011109439. The reversal of 18011109436 is 63490111081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18011109439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2251388676 + ... + 2251388683.

Almost surely, 2^18011109436 is an apocalyptic number.

It is an amenable number.

18011109436 is a deficient number, since it is larger than the sum of its proper divisors (13508332084).

18011109436 is a wasteful number, since it uses less digits than its factorization.

18011109436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4502777363 (or 4502777361 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The spelling of 18011109436 in words is "eighteen billion, eleven million, one hundred nine thousand, four hundred thirty-six".