181681911248 has 20 divisors (see below), whose sum is σ = 360594282468. Its totient is φ = 88625322240.

The previous prime is 181681911247. The next prime is 181681911251. The reversal of 181681911248 is 842119186181.

181681911248 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 55520554384 + 126161356864 = 235628^2 + 355192^2 .

It is a super-2 number, since 2×181681911248² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 181681911196 and 181681911205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181681911241) 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 3 ways as a sum of consecutive naturals, for example, 138476411 + ... + 138477722.

Almost surely, 2^181681911248 is an apocalyptic number.

It is an amenable number.

181681911248 is a deficient number, since it is larger than the sum of its proper divisors (178912371220).

181681911248 is a wasteful number, since it uses less digits than its factorization.

181681911248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276954182 (or 276954176 counting only the distinct ones).

The product of its digits is 221184, while the sum is 50.

The spelling of 181681911248 in words is "one hundred eighty-one billion, six hundred eighty-one million, nine hundred eleven thousand, two hundred forty-eight".