18318165031536 has 80 divisors (see below), whose sum is σ = 48240465269760. Its totient is φ = 5987656546560.

The previous prime is 18318165031511. The next prime is 18318165031577. The reversal of 18318165031536 is 63513056181381.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2864121 + ... + 6696231.

It is an arithmetic number, because the mean of its divisors is an integer number (603005815872).

Almost surely, 2^{18318165031536} is an apocalyptic number.

18318165031536 is a gapful number since it is divisible by the number (16) 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 18318165031536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24120232634880).

18318165031536 is an abundant number, since it is smaller than the sum of its proper divisors (29922300238224).

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

18318165031536 is a wasteful number, since it uses less digits than its factorization.

18318165031536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3834054 (or 3834048 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 51.

The spelling of 18318165031536 in words is "eighteen trillion, three hundred eighteen billion, one hundred sixty-five million, thirty-one thousand, five hundred thirty-six".