18338505503533 has 2 divisors, whose sum is σ = 18338505503534. Its totient is φ = 18338505503532.

The previous prime is 18338505503519. The next prime is 18338505503573. The reversal of 18338505503533 is 33530550583381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16601281334089 + 1737224169444 = 4074467^2 + 1318038^2 .

It is a cyclic number.

It is not a de Polignac number, because 18338505503533 - 2²⁵ = 18338471949101 is a prime.

It is a super-2 number, since 2×18338505503533² (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 (18338505503573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9169252751766 + 9169252751767.

It is an arithmetic number, because the mean of its divisors is an integer number (9169252751767).

Almost surely, 2^{18338505503533} is an apocalyptic number.

It is an amenable number.

18338505503533 is a deficient number, since it is larger than the sum of its proper divisors (1).

18338505503533 is an equidigital number, since it uses as much as digits as its factorization.

18338505503533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720000, while the sum is 52.

The spelling of 18338505503533 in words is "eighteen trillion, three hundred thirty-eight billion, five hundred five million, five hundred three thousand, five hundred thirty-three".