181987535212 has 48 divisors (see below), whose sum is σ = 375800320000. Its totient is φ = 75461803200.

The previous prime is 181987535183. The next prime is 181987535231. The reversal of 181987535212 is 212535789181.

It is a self number, because there is not a number n which added to its sum of digits gives 181987535212.

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, 4318162 + ... + 4360102.

Almost surely, 2^181987535212 is an apocalyptic number.

It is an amenable number.

181987535212 is an abundant number, since it is smaller than the sum of its proper divisors (193812784788).

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

181987535212 is a wasteful number, since it uses less digits than its factorization.

181987535212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46982 (or 46980 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 52.

The spelling of 181987535212 in words is "one hundred eighty-one billion, nine hundred eighty-seven million, five hundred thirty-five thousand, two hundred twelve".