18551068499 has 2 divisors, whose sum is σ = 18551068500. Its totient is φ = 18551068498.

The previous prime is 18551068477. The next prime is 18551068517. The reversal of 18551068499 is 99486015581.

It is a strong prime.

It is an emirp because it is prime and its reverse (99486015581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18551068499 - 2²⁴ = 18534291283 is a prime.

It is a super-2 number, since 2×18551068499² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18551068199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9275534249 + 9275534250.

It is an arithmetic number, because the mean of its divisors is an integer number (9275534250).

Almost surely, 2^18551068499 is an apocalyptic number.

18551068499 is a deficient number, since it is larger than the sum of its proper divisors (1).

18551068499 is an equidigital number, since it uses as much as digits as its factorization.

18551068499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 56.

The spelling of 18551068499 in words is "eighteen billion, five hundred fifty-one million, sixty-eight thousand, four hundred ninety-nine".