181791998652 has 144 divisors (see below), whose sum is σ = 476761614336. Its totient is φ = 53860224000.

The previous prime is 181791998621. The next prime is 181791998659. The reversal of 181791998652 is 256899197181.

181791998652 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181791998659) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 11682277 + ... + 11697827.

It is an arithmetic number, because the mean of its divisors is an integer number (3310844544).

Almost surely, 2^181791998652 is an apocalyptic number.

181791998652 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 181791998652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238380807168).

181791998652 is an abundant number, since it is smaller than the sum of its proper divisors (294969615684).

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

181791998652 is a wasteful number, since it uses less digits than its factorization.

181791998652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15760 (or 15747 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 66.

The spelling of 181791998652 in words is "one hundred eighty-one billion, seven hundred ninety-one million, nine hundred ninety-eight thousand, six hundred fifty-two".