18505435133 has 2 divisors, whose sum is σ = 18505435134. Its totient is φ = 18505435132.

The previous prime is 18505435127. The next prime is 18505435141. The reversal of 18505435133 is 33153450581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12615333124 + 5890102009 = 112318^2 + 76747^2 .

It is a cyclic number.

It is not a de Polignac number, because 18505435133 - 2²⁴ = 18488657917 is a prime.

It is a super-2 number, since 2×18505435133² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18505435183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9252717566 + 9252717567.

It is an arithmetic number, because the mean of its divisors is an integer number (9252717567).

Almost surely, 2^18505435133 is an apocalyptic number.

It is an amenable number.

18505435133 is a deficient number, since it is larger than the sum of its proper divisors (1).

18505435133 is an equidigital number, since it uses as much as digits as its factorization.

18505435133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 18505435133 in words is "eighteen billion, five hundred five million, four hundred thirty-five thousand, one hundred thirty-three".