18683218208 has 54 divisors (see below), whose sum is σ = 37406368377. Its totient is φ = 9185806080.

The previous prime is 18683218171. The next prime is 18683218231. The reversal of 18683218208 is 80281238681.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 18597322384 + 85895824 = 136372^2 + 9268^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=96652.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 56444603 + ... + 56444933.

Almost surely, 2^18683218208 is an apocalyptic number.

It is an amenable number.

18683218208 is an abundant number, since it is smaller than the sum of its proper divisors (18723150169).

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

18683218208 is an frugal number, since it uses more digits than its factorization.

18683218208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818 (or 406 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 47.

The spelling of 18683218208 in words is "eighteen billion, six hundred eighty-three million, two hundred eighteen thousand, two hundred eight".