18051505181 has 2 divisors, whose sum is σ = 18051505182. Its totient is φ = 18051505180.

The previous prime is 18051505141. The next prime is 18051505201. The reversal of 18051505181 is 18150515081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15398328100 + 2653177081 = 124090^2 + 51509^2 .

It is an emirp because it is prime and its reverse (18150515081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18051505181 - 2²⁶ = 17984396317 is a prime.

It is a super-2 number, since 2×18051505181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18051505141) 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 as a sum of consecutive naturals, namely, 9025752590 + 9025752591.

It is an arithmetic number, because the mean of its divisors is an integer number (9025752591).

Almost surely, 2^18051505181 is an apocalyptic number.

It is an amenable number.

18051505181 is a deficient number, since it is larger than the sum of its proper divisors (1).

18051505181 is an equidigital number, since it uses as much as digits as its factorization.

18051505181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8000, while the sum is 35.

The spelling of 18051505181 in words is "eighteen billion, fifty-one million, five hundred five thousand, one hundred eighty-one".