18264211081 has 2 divisors, whose sum is σ = 18264211082. Its totient is φ = 18264211080.

The previous prime is 18264211057. The next prime is 18264211087. The reversal of 18264211081 is 18011246281.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17757961081 + 506250000 = 133259^2 + 22500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18264211081 is a prime.

It is a super-3 number, since 3×18264211081³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (18264211087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9132105540 + 9132105541.

It is an arithmetic number, because the mean of its divisors is an integer number (9132105541).

Almost surely, 2^18264211081 is an apocalyptic number.

It is an amenable number.

18264211081 is a deficient number, since it is larger than the sum of its proper divisors (1).

18264211081 is an equidigital number, since it uses as much as digits as its factorization.

18264211081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 34.

The spelling of 18264211081 in words is "eighteen billion, two hundred sixty-four million, two hundred eleven thousand, eighty-one".