18165606536 has 128 divisors (see below), whose sum is σ = 43759872000. Its totient is φ = 7007595840.

The previous prime is 18165606533. The next prime is 18165606577. The reversal of 18165606536 is 63560656181.

It is not an unprimeable number, because it can be changed into a prime (18165606533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3106031 + ... + 3111873.

It is an arithmetic number, because the mean of its divisors is an integer number (341874000).

Almost surely, 2^18165606536 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 18165606536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21879936000).

18165606536 is an abundant number, since it is smaller than the sum of its proper divisors (25594265464).

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

18165606536 is a wasteful number, since it uses less digits than its factorization.

18165606536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5984 (or 5966 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 18165606536 in words is "eighteen billion, one hundred sixty-five million, six hundred six thousand, five hundred thirty-six".