12641811205 has 4 divisors (see below), whose sum is σ = 15170173452. Its totient is φ = 10113448960.

The previous prime is 12641811179. The next prime is 12641811211. The reversal of 12641811205 is 50211814621.

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 9987603844 + 2654207361 = 99938^2 + 51519^2 .

It is not a de Polignac number, because 12641811205 - 2¹¹ = 12641809157 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 1264181116 + ... + 1264181125.

It is an arithmetic number, because the mean of its divisors is an integer number (3792543363).

Almost surely, 2^12641811205 is an apocalyptic number.

It is an amenable number.

12641811205 is a deficient number, since it is larger than the sum of its proper divisors (2528362247).

12641811205 is an equidigital number, since it uses as much as digits as its factorization.

12641811205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2528362246.

The product of its (nonzero) digits is 3840, while the sum is 31.

The spelling of 12641811205 in words is "twelve billion, six hundred forty-one million, eight hundred eleven thousand, two hundred five".