18536393172 has 144 divisors (see below), whose sum is σ = 48164905152. Its totient is φ = 5544000000.

The previous prime is 18536393171. The next prime is 18536393201. The reversal of 18536393172 is 27139363581.

Its product of digits (816480) is a multiple of the sum of its prime divisors (729).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18536393171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 65965672 + ... + 65965952.

It is an arithmetic number, because the mean of its divisors is an integer number (334478508).

Almost surely, 2^18536393172 is an apocalyptic number.

18536393172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18536393172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24082452576).

18536393172 is an abundant number, since it is smaller than the sum of its proper divisors (29628511980).

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

18536393172 is a wasteful number, since it uses less digits than its factorization.

18536393172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742 (or 729 counting only the distinct ones).

The product of its digits is 816480, while the sum is 48.

The spelling of 18536393172 in words is "eighteen billion, five hundred thirty-six million, three hundred ninety-three thousand, one hundred seventy-two".