18031005000000 has 840 divisors, whose sum is σ = 67129907346216. Its totient is φ = 4785480000000.

The previous prime is 18031004999981. The next prime is 18031005000067. The reversal of 18031005000000 is 50013081.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 4 ways, for example, as 17836904837376 + 194100162624 = 4223376^2 + 440568^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 85454999895 + ... + 85455000105.

Almost surely, 2^{18031005000000} is an apocalyptic number.

18031005000000 is a gapful number since it is divisible by the number (10) 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 18031005000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33564953673108).

18031005000000 is an abundant number, since it is smaller than the sum of its proper divisors (49098902346216).

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

18031005000000 is an frugal number, since it uses more digits than its factorization.

18031005000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 18031005000000 its reverse (50013081), we get a palindrome (18031055013081).

The spelling of 18031005000000 in words is "eighteen trillion, thirty-one billion, five million", and thus it is an aban number and an uban number.