18665490511 has 2 divisors, whose sum is σ = 18665490512. Its totient is φ = 18665490510.

The previous prime is 18665490509. The next prime is 18665490619. The reversal of 18665490511 is 11509456681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18665490511 - 2¹ = 18665490509 is a prime.

It is a super-2 number, since 2×18665490511² (a number of 21 digits) contains 22 as substring.

Together with 18665490509, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18665490911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9332745255 + 9332745256.

It is an arithmetic number, because the mean of its divisors is an integer number (9332745256).

Almost surely, 2^18665490511 is an apocalyptic number.

18665490511 is a deficient number, since it is larger than the sum of its proper divisors (1).

18665490511 is an equidigital number, since it uses as much as digits as its factorization.

18665490511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 46.

The spelling of 18665490511 in words is "eighteen billion, six hundred sixty-five million, four hundred ninety thousand, five hundred eleven".