18218138265611 has 2 divisors, whose sum is σ = 18218138265612. Its totient is φ = 18218138265610.

The previous prime is 18218138265583. The next prime is 18218138265667. The reversal of 18218138265611 is 11656283181281.

It is a weak prime.

It is an emirp because it is prime and its reverse (11656283181281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18218138265611 - 2¹⁰ = 18218138264587 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18218138265671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9109069132805 + 9109069132806.

It is an arithmetic number, because the mean of its divisors is an integer number (9109069132806).

Almost surely, 2^{18218138265611} is an apocalyptic number.

18218138265611 is a deficient number, since it is larger than the sum of its proper divisors (1).

18218138265611 is an equidigital number, since it uses as much as digits as its factorization.

18218138265611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1105920, while the sum is 53.

The spelling of 18218138265611 in words is "eighteen trillion, two hundred eighteen billion, one hundred thirty-eight million, two hundred sixty-five thousand, six hundred eleven".