181888611012 has 18 divisors (see below), whose sum is σ = 459773989038. Its totient is φ = 60629536992.

The previous prime is 181888610989. The next prime is 181888611013. The reversal of 181888611012 is 210116888181.

It is a happy number.

181888611012 is a `hidden beast` number, since 1 + 8 + 18 + 8 + 8 + 611 + 0 + 12 = 666.

It can be written as a sum of positive squares in only one way, i.e., 135811412676 + 46077198336 = 368526^2 + 214656^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (181888611013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2526230673 + ... + 2526230744.

It is an arithmetic number, because the mean of its divisors is an integer number (25542999391).

Almost surely, 2^181888611012 is an apocalyptic number.

181888611012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

181888611012 is an abundant number, since it is smaller than the sum of its proper divisors (277885378026).

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

181888611012 is a wasteful number, since it uses less digits than its factorization.

181888611012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5052461427 (or 5052461422 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 45.

The spelling of 181888611012 in words is "one hundred eighty-one billion, eight hundred eighty-eight million, six hundred eleven thousand, twelve".