12811585705 has 4 divisors (see below), whose sum is σ = 15373902852. Its totient is φ = 10249268560.

The previous prime is 12811585687. The next prime is 12811585771. The reversal of 12811585705 is 50758511821.

12811585705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3951505321 + 8860080384 = 62861^2 + 94128^2 .

It is not a de Polignac number, because 12811585705 - 2⁵ = 12811585673 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1281158566 + ... + 1281158575.

It is an arithmetic number, because the mean of its divisors is an integer number (3843475713).

Almost surely, 2^12811585705 is an apocalyptic number.

It is an amenable number.

12811585705 is a deficient number, since it is larger than the sum of its proper divisors (2562317147).

12811585705 is an equidigital number, since it uses as much as digits as its factorization.

12811585705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562317146.

The product of its (nonzero) digits is 112000, while the sum is 43.

The spelling of 12811585705 in words is "twelve billion, eight hundred eleven million, five hundred eighty-five thousand, seven hundred five".