181638191382 has 16 divisors (see below), whose sum is σ = 363290270832. Its totient is φ = 60543749120.

The previous prime is 181638191377. The next prime is 181638191417. The reversal of 181638191382 is 283191836181.

181638191382 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 404619 + ... + 725942.

It is an arithmetic number, because the mean of its divisors is an integer number (22705641927).

Almost surely, 2^181638191382 is an apocalyptic number.

181638191382 is an abundant number, since it is smaller than the sum of its proper divisors (181652079450).

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

181638191382 is a wasteful number, since it uses less digits than its factorization.

181638191382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157343.

The product of its digits is 497664, while the sum is 51.

The spelling of 181638191382 in words is "one hundred eighty-one billion, six hundred thirty-eight million, one hundred ninety-one thousand, three hundred eighty-two".