18434639118 has 32 divisors (see below), whose sum is σ = 43495557120. Its totient is φ = 5097134880.

The previous prime is 18434639107. The next prime is 18434639141. The reversal of 18434639118 is 81193643481.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7078053 + ... + 7080656.

It is an arithmetic number, because the mean of its divisors is an integer number (1359236160).

Almost surely, 2^18434639118 is an apocalyptic number.

18434639118 is an abundant number, since it is smaller than the sum of its proper divisors (25060918002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18434639118 is a wasteful number, since it uses less digits than its factorization.

18434639118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14158752.

The product of its digits is 497664, while the sum is 48.

It can be divided in two parts, 1843463 and 9118, that added together give a palindrome (1852581).

The spelling of 18434639118 in words is "eighteen billion, four hundred thirty-four million, six hundred thirty-nine thousand, one hundred eighteen".