12641043605 has 4 divisors (see below), whose sum is σ = 15169252332. Its totient is φ = 10112834880.

The previous prime is 12641043487. The next prime is 12641043619. The reversal of 12641043605 is 50634014621.

12641043605 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, and also an emirpimes, since its reverse is a distinct semiprime: 50634014621 = 13103 ⋅3864307.

It can be written as a sum of positive squares in 2 ways, for example, as 10039839601 + 2601204004 = 100199^2 + 51002^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12641043605 is a prime.

It is a super-2 number, since 2×12641043605² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent 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, 1264104356 + ... + 1264104365.

It is an arithmetic number, because the mean of its divisors is an integer number (3792313083).

Almost surely, 2^12641043605 is an apocalyptic number.

It is an amenable number.

12641043605 is a deficient number, since it is larger than the sum of its proper divisors (2528208727).

12641043605 is an equidigital number, since it uses as much as digits as its factorization.

12641043605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528208726.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 12641043605 in words is "twelve billion, six hundred forty-one million, forty-three thousand, six hundred five".