12288165905 has 4 divisors (see below), whose sum is σ = 14745799092. Its totient is φ = 9830532720.

The previous prime is 12288165899. The next prime is 12288165937. The reversal of 12288165905 is 50956188221.

It is a Cunningham number, because it is equal to 110852²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50956188221 = 269 ⋅189428209.

It can be written as a sum of positive squares in 2 ways, for example, as 4423846144 + 7864319761 = 66512^2 + 88681^2 .

It is not a de Polignac number, because 12288165905 - 2²⁶ = 12221057041 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 12288165905.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1228816586 + ... + 1228816595.

It is an arithmetic number, because the mean of its divisors is an integer number (3686449773).

Almost surely, 2^12288165905 is an apocalyptic number.

It is an amenable number.

12288165905 is a deficient number, since it is larger than the sum of its proper divisors (2457633187).

12288165905 is an equidigital number, since it uses as much as digits as its factorization.

12288165905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2457633186.

The product of its (nonzero) digits is 345600, while the sum is 47.

The spelling of 12288165905 in words is "twelve billion, two hundred eighty-eight million, one hundred sixty-five thousand, nine hundred five".