18436122511 has 2 divisors, whose sum is σ = 18436122512. Its totient is φ = 18436122510.

The previous prime is 18436122491. The next prime is 18436122517. The reversal of 18436122511 is 11522163481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18436122511 - 2¹⁵ = 18436089743 is a prime.

It is a super-2 number, since 2×18436122511² (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 (18436122517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9218061255 + 9218061256.

It is an arithmetic number, because the mean of its divisors is an integer number (9218061256).

Almost surely, 2^18436122511 is an apocalyptic number.

18436122511 is a deficient number, since it is larger than the sum of its proper divisors (1).

18436122511 is an equidigital number, since it uses as much as digits as its factorization.

18436122511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 34.

Adding to 18436122511 its reverse (11522163481), we get a palindrome (29958285992).

The spelling of 18436122511 in words is "eighteen billion, four hundred thirty-six million, one hundred twenty-two thousand, five hundred eleven".