18400027511 has 2 divisors, whose sum is σ = 18400027512. Its totient is φ = 18400027510.

The previous prime is 18400027489. The next prime is 18400027553. The reversal of 18400027511 is 11572000481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18400027511 - 2¹⁴ = 18400011127 is a prime.

It is a super-2 number, since 2×18400027511² (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 (18400027111) 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, 9200013755 + 9200013756.

It is an arithmetic number, because the mean of its divisors is an integer number (9200013756).

Almost surely, 2^18400027511 is an apocalyptic number.

18400027511 is a deficient number, since it is larger than the sum of its proper divisors (1).

18400027511 is an equidigital number, since it uses as much as digits as its factorization.

18400027511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 29.

Adding to 18400027511 its reverse (11572000481), we get a palindrome (29972027992).

The spelling of 18400027511 in words is "eighteen billion, four hundred million, twenty-seven thousand, five hundred eleven".