18336867235509 has 4 divisors (see below), whose sum is σ = 24449156314016. Its totient is φ = 12224578157004.

The previous prime is 18336867235501. The next prime is 18336867235529. The reversal of 18336867235509 is 90553276863381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18336867235509 - 2³ = 18336867235501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18336867235509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18336867235501) 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 in 3 ways as a sum of consecutive naturals, for example, 3056144539249 + ... + 3056144539254.

It is an arithmetic number, because the mean of its divisors is an integer number (6112289078504).

Almost surely, 2^{18336867235509} is an apocalyptic number.

It is an amenable number.

18336867235509 is a deficient number, since it is larger than the sum of its proper divisors (6112289078507).

18336867235509 is an equidigital number, since it uses as much as digits as its factorization.

18336867235509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6112289078506.

The product of its (nonzero) digits is 195955200, while the sum is 66.

The spelling of 18336867235509 in words is "eighteen trillion, three hundred thirty-six billion, eight hundred sixty-seven million, two hundred thirty-five thousand, five hundred nine".