181189530164 has 12 divisors (see below), whose sum is σ = 317979928644. Its totient is φ = 90338121984.

The previous prime is 181189530149. The next prime is 181189530199. The reversal of 181189530164 is 461035981181.

It can be written as a sum of positive squares in 2 ways, for example, as 139907417764 + 41282112400 = 374042^2 + 203180^2 .

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64159187 + ... + 64162010.

It is an arithmetic number, because the mean of its divisors is an integer number (26498327387).

Almost surely, 2^181189530164 is an apocalyptic number.

It is an amenable number.

181189530164 is a deficient number, since it is larger than the sum of its proper divisors (136790398480).

181189530164 is a wasteful number, since it uses less digits than its factorization.

181189530164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128321554 (or 128321552 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 47.

The spelling of 181189530164 in words is "one hundred eighty-one billion, one hundred eighty-nine million, five hundred thirty thousand, one hundred sixty-four".