18267305081 has 2 divisors, whose sum is σ = 18267305082. Its totient is φ = 18267305080.

The previous prime is 18267305053. The next prime is 18267305099. The reversal of 18267305081 is 18050376281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13992760681 + 4274544400 = 118291^2 + 65380^2 .

It is a cyclic number.

It is not a de Polignac number, because 18267305081 - 2²² = 18263110777 is a prime.

It is a super-2 number, since 2×18267305081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18267335081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9133652540 + 9133652541.

It is an arithmetic number, because the mean of its divisors is an integer number (9133652541).

Almost surely, 2^18267305081 is an apocalyptic number.

It is an amenable number.

18267305081 is a deficient number, since it is larger than the sum of its proper divisors (1).

18267305081 is an equidigital number, since it uses as much as digits as its factorization.

18267305081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 41.

The spelling of 18267305081 in words is "eighteen billion, two hundred sixty-seven million, three hundred five thousand, eighty-one".