18135411881 has 2 divisors, whose sum is σ = 18135411882. Its totient is φ = 18135411880.

The previous prime is 18135411829. The next prime is 18135411883. The reversal of 18135411881 is 18811453181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16617530281 + 1517881600 = 128909^2 + 38960^2 .

It is a cyclic number.

It is not a de Polignac number, because 18135411881 - 2¹⁴ = 18135395497 is a prime.

It is a super-2 number, since 2×18135411881² (a number of 21 digits) contains 22 as substring.

Together with 18135411883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18135411883) 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, 9067705940 + 9067705941.

It is an arithmetic number, because the mean of its divisors is an integer number (9067705941).

Almost surely, 2^18135411881 is an apocalyptic number.

It is an amenable number.

18135411881 is a deficient number, since it is larger than the sum of its proper divisors (1).

18135411881 is an equidigital number, since it uses as much as digits as its factorization.

18135411881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30720, while the sum is 41.

The spelling of 18135411881 in words is "eighteen billion, one hundred thirty-five million, four hundred eleven thousand, eight hundred eighty-one".