18180316536 has 128 divisors (see below), whose sum is σ = 47546361600. Its totient is φ = 5789076480.

The previous prime is 18180316529. The next prime is 18180316549. The reversal of 18180316536 is 63561308181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7159155 + ... + 7161693.

It is an arithmetic number, because the mean of its divisors is an integer number (371455950).

Almost surely, 2^18180316536 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 18180316536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23773180800).

18180316536 is an abundant number, since it is smaller than the sum of its proper divisors (29366045064).

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

18180316536 is a wasteful number, since it uses less digits than its factorization.

18180316536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2749 (or 2745 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 18180316536 in words is "eighteen billion, one hundred eighty million, three hundred sixteen thousand, five hundred thirty-six".