18128084181 has 16 divisors (see below), whose sum is σ = 25598545344. Its totient is φ = 11371837184.

The previous prime is 18128084137. The next prime is 18128084209. The reversal of 18128084181 is 18148082181.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18128084181 - 2⁹ = 18128083669 is a prime.

It is a super-2 number, since 2×18128084181² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18128084131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192811 + ... + 270983.

It is an arithmetic number, because the mean of its divisors is an integer number (1599909084).

Almost surely, 2^18128084181 is an apocalyptic number.

It is an amenable number.

18128084181 is a deficient number, since it is larger than the sum of its proper divisors (7470461163).

18128084181 is a wasteful number, since it uses less digits than its factorization.

18128084181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82740.

The product of its (nonzero) digits is 32768, while the sum is 42.

The spelling of 18128084181 in words is "eighteen billion, one hundred twenty-eight million, eighty-four thousand, one hundred eighty-one".