11813634218 has 8 divisors (see below), whose sum is σ = 18653106720. Its totient is φ = 5595931980.

The previous prime is 11813634139. The next prime is 11813634229. The reversal of 11813634218 is 81243631811.

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

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 310885111 = 11813634218 / (1 + 1 + 8 + 1 + 3 + 6 + 3 + 4 + 2 + 1 + 8).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155442518 + ... + 155442593.

It is an arithmetic number, because the mean of its divisors is an integer number (2331638340).

Almost surely, 2^11813634218 is an apocalyptic number.

11813634218 is a deficient number, since it is larger than the sum of its proper divisors (6839472502).

11813634218 is a wasteful number, since it uses less digits than its factorization.

11813634218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310885132.

The product of its digits is 27648, while the sum is 38.

The spelling of 11813634218 in words is "eleven billion, eight hundred thirteen million, six hundred thirty-four thousand, two hundred eighteen".