181340863812 has 72 divisors (see below), whose sum is σ = 488260071936. Its totient is φ = 56550553344.

The previous prime is 181340863807. The next prime is 181340863841. The reversal of 181340863812 is 218368043181.

181340863812 is a `hidden beast` number, since 1 + 8 + 1 + 3 + 4 + 0 + 8 + 638 + 1 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 784948 + ... + 989355.

It is an arithmetic number, because the mean of its divisors is an integer number (6781389888).

Almost surely, 2^181340863812 is an apocalyptic number.

181340863812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

181340863812 is an abundant number, since it is smaller than the sum of its proper divisors (306919208124).

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

181340863812 is a wasteful number, since it uses less digits than its factorization.

181340863812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1774497 (or 1774492 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The spelling of 181340863812 in words is "one hundred eighty-one billion, three hundred forty million, eight hundred sixty-three thousand, eight hundred twelve".