18436654808 has 144 divisors (see below), whose sum is σ = 41400639000. Its totient is φ = 7687680000.

The previous prime is 18436654799. The next prime is 18436654829. The reversal of 18436654808 is 80845663481.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18436654808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 41061368 + ... + 41061816.

Almost surely, 2^18436654808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18436654808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20700319500).

18436654808 is an abundant number, since it is smaller than the sum of its proper divisors (22963984192).

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

18436654808 is a wasteful number, since it uses less digits than its factorization.

18436654808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754 (or 726 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 53.

The spelling of 18436654808 in words is "eighteen billion, four hundred thirty-six million, six hundred fifty-four thousand, eight hundred eight".