18665490911 has 2 divisors, whose sum is σ = 18665490912. Its totient is φ = 18665490910.

The previous prime is 18665490859. The next prime is 18665490953. The reversal of 18665490911 is 11909456681.

It is a strong prime.

It is an emirp because it is prime and its reverse (11909456681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18665490911 - 2²² = 18661296607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18665490911.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18665490511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9332745455 + 9332745456.

It is an arithmetic number, because the mean of its divisors is an integer number (9332745456).

Almost surely, 2^18665490911 is an apocalyptic number.

18665490911 is a deficient number, since it is larger than the sum of its proper divisors (1).

18665490911 is an equidigital number, since it uses as much as digits as its factorization.

18665490911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 50.

The spelling of 18665490911 in words is "eighteen billion, six hundred sixty-five million, four hundred ninety thousand, nine hundred eleven".