1800181800216 has 256 divisors, whose sum is σ = 5324378572800. Its totient is φ = 562731494400.

The previous prime is 1800181800191. The next prime is 1800181800223. The reversal of 1800181800216 is 6120081810081.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27163681 + ... + 27229871.

It is an arithmetic number, because the mean of its divisors is an integer number (20798353800).

Almost surely, 2^{1800181800216} 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 1800181800216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2662189286400).

1800181800216 is an abundant number, since it is smaller than the sum of its proper divisors (3524196772584).

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

1800181800216 is a wasteful number, since it uses less digits than its factorization.

1800181800216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66367 (or 66357 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 36.

The spelling of 1800181800216 in words is "one trillion, eight hundred billion, one hundred eighty-one million, eight hundred thousand, two hundred sixteen".