181818180199836 has 120 divisors (see below), whose sum is σ = 492204999187440. Its totient is φ = 58455929145600.

The previous prime is 181818180199819. The next prime is 181818180199841. The reversal of 181818180199836 is 638991081818181.

181818180199836 is a `hidden beast` number, since 1 + 8 + 181 + 8 + 180 + 199 + 83 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 840745 + ... + 19087776.

It is an arithmetic number, because the mean of its divisors is an integer number (4101708326562).

Almost surely, 2^{181818180199836} 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 181818180199836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246102499593720).

181818180199836 is an abundant number, since it is smaller than the sum of its proper divisors (310386818987604).

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

181818180199836 is a wasteful number, since it uses less digits than its factorization.

181818180199836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19929537 (or 19929526 counting only the distinct ones).

The product of its (nonzero) digits is 47775744, while the sum is 72.

The spelling of 181818180199836 in words is "one hundred eighty-one trillion, eight hundred eighteen billion, one hundred eighty million, one hundred ninety-nine thousand, eight hundred thirty-six".