18143234181 has 12 divisors (see below), whose sum is σ = 26209849900. Its totient is φ = 12094125120.

The previous prime is 18143234167. The next prime is 18143234191.

18143234181 is a `hidden beast` number, since 18 + 1 + 432 + 34 + 181 = 666.

18143234181 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 11764656225 + 6378577956 = 108465^2 + 79866^2 .

It is not a de Polignac number, because 18143234181 - 2⁵ = 18143234149 is a prime.

It is a super-2 number, since 2×18143234181² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18143234191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25906 + ... + 192243.

Almost surely, 2^18143234181 is an apocalyptic number.

It is an amenable number.

18143234181 is a deficient number, since it is larger than the sum of its proper divisors (8066615719).

18143234181 is a wasteful number, since it uses less digits than its factorization.

18143234181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227396 (or 227393 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The spelling of 18143234181 in words is "eighteen billion, one hundred forty-three million, two hundred thirty-four thousand, one hundred eighty-one".