181821650832 has 80 divisors (see below), whose sum is σ = 524174784000. Its totient is φ = 60342523776.

The previous prime is 181821650819. The next prime is 181821650863. The reversal of 181821650832 is 238056128181.

It is a super-2 number, since 2×181821650832² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 820032 + ... + 1017887.

It is an arithmetic number, because the mean of its divisors is an integer number (6552184800).

Almost surely, 2^181821650832 is an apocalyptic number.

181821650832 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

181821650832 is an abundant number, since it is smaller than the sum of its proper divisors (342353133168).

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

181821650832 is a wasteful number, since it uses less digits than its factorization.

181821650832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838165 (or 1838153 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The spelling of 181821650832 in words is "one hundred eighty-one billion, eight hundred twenty-one million, six hundred fifty thousand, eight hundred thirty-two".