18488942181 has 6 divisors (see below), whose sum is σ = 26706249830. Its totient is φ = 12325961448.

The previous prime is 18488942149. The next prime is 18488942183. The reversal of 18488942181 is 18124988481.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17382049281 + 1106892900 = 131841^2 + 33270^2 .

It is not a de Polignac number, because 18488942181 - 2⁵ = 18488942149 is a prime.

It is a super-2 number, since 2×18488942181² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18488942183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1027163446 + ... + 1027163463.

Almost surely, 2^18488942181 is an apocalyptic number.

It is an amenable number.

18488942181 is a deficient number, since it is larger than the sum of its proper divisors (8217307649).

18488942181 is a wasteful number, since it uses less digits than its factorization.

18488942181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2054326915 (or 2054326912 counting only the distinct ones).

The product of its digits is 1179648, while the sum is 54.

The spelling of 18488942181 in words is "eighteen billion, four hundred eighty-eight million, nine hundred forty-two thousand, one hundred eighty-one".