11518505566223 has 2 divisors, whose sum is σ = 11518505566224. Its totient is φ = 11518505566222.

The previous prime is 11518505566181. The next prime is 11518505566279. The reversal of 11518505566223 is 32266550581511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11518505566223 - 2¹² = 11518505562127 is a prime.

It is a super-2 number, since 2×11518505566223² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11518505566123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5759252783111 + 5759252783112.

It is an arithmetic number, because the mean of its divisors is an integer number (5759252783112).

Almost surely, 2^{11518505566223} is an apocalyptic number.

11518505566223 is a deficient number, since it is larger than the sum of its proper divisors (1).

11518505566223 is an equidigital number, since it uses as much as digits as its factorization.

11518505566223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160000, while the sum is 50.

The spelling of 11518505566223 in words is "eleven trillion, five hundred eighteen billion, five hundred five million, five hundred sixty-six thousand, two hundred twenty-three".