18455105509 has 2 divisors, whose sum is σ = 18455105510. Its totient is φ = 18455105508.

The previous prime is 18455105503. The next prime is 18455105519. The reversal of 18455105509 is 90550155481.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9770729409 + 8684376100 = 98847^2 + 93190^2 .

It is a cyclic number.

It is not a de Polignac number, because 18455105509 - 2¹¹ = 18455103461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18455105503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9227552754 + 9227552755.

It is an arithmetic number, because the mean of its divisors is an integer number (9227552755).

Almost surely, 2^18455105509 is an apocalyptic number.

It is an amenable number.

18455105509 is a deficient number, since it is larger than the sum of its proper divisors (1).

18455105509 is an equidigital number, since it uses as much as digits as its factorization.

18455105509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180000, while the sum is 43.

The spelling of 18455105509 in words is "eighteen billion, four hundred fifty-five million, one hundred five thousand, five hundred nine".