18201540688 has 80 divisors (see below), whose sum is σ = 38582459136. Its totient is φ = 8284989440.

The previous prime is 18201540673. The next prime is 18201540701. The reversal of 18201540688 is 88604510281.

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, 1014645 + ... + 1032427.

Almost surely, 2^18201540688 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 18201540688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19291229568).

18201540688 is an abundant number, since it is smaller than the sum of its proper divisors (20380918448).

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

18201540688 is a wasteful number, since it uses less digits than its factorization.

18201540688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17932 (or 17926 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 43.

The spelling of 18201540688 in words is "eighteen billion, two hundred one million, five hundred forty thousand, six hundred eighty-eight".