181814220000 has 600 divisors, whose sum is σ = 763675433136. Its totient is φ = 41554944000.

The previous prime is 181814219999. The next prime is 181814220013. The reversal of 181814220000 is 22418181.

It is a tau number, because it is divible by the number of its divisors (600).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 99 ways as a sum of consecutive naturals, for example, 11331984 + ... + 11348016.

Almost surely, 2^181814220000 is an apocalyptic number.

181814220000 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 181814220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (381837716568).

181814220000 is an abundant number, since it is smaller than the sum of its proper divisors (581861213136).

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

181814220000 is an equidigital number, since it uses as much as digits as its factorization.

181814220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16082 (or 16050 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

Adding to 181814220000 its reverse (22418181), we get a palindrome (181836638181).

The spelling of 181814220000 in words is "one hundred eighty-one billion, eight hundred fourteen million, two hundred twenty thousand".