18913665611 has 2 divisors, whose sum is σ = 18913665612. Its totient is φ = 18913665610.

The previous prime is 18913665581. The next prime is 18913665613. The reversal of 18913665611 is 11656631981.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (11656631981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18913665611 - 2²² = 18909471307 is a prime.

Together with 18913665613, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18913665613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9456832805 + 9456832806.

It is an arithmetic number, because the mean of its divisors is an integer number (9456832806).

Almost surely, 2^18913665611 is an apocalyptic number.

18913665611 is a deficient number, since it is larger than the sum of its proper divisors (1).

18913665611 is an equidigital number, since it uses as much as digits as its factorization.

18913665611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 47.

The spelling of 18913665611 in words is "eighteen billion, nine hundred thirteen million, six hundred sixty-five thousand, six hundred eleven".