12606621205 has 4 divisors (see below), whose sum is σ = 15127945452. Its totient is φ = 10085296960.

The previous prime is 12606621187. The next prime is 12606621211. The reversal of 12606621205 is 50212660621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50212660621 = 79 ⋅635603299.

It can be written as a sum of positive squares in 2 ways, for example, as 2174450161 + 10432171044 = 46631^2 + 102138^2 .

It is not a de Polignac number, because 12606621205 - 2⁵ = 12606621173 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1260662116 + ... + 1260662125.

It is an arithmetic number, because the mean of its divisors is an integer number (3781986363).

Almost surely, 2^12606621205 is an apocalyptic number.

It is an amenable number.

12606621205 is a deficient number, since it is larger than the sum of its proper divisors (2521324247).

12606621205 is an equidigital number, since it uses as much as digits as its factorization.

12606621205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2521324246.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 12606621205 in words is "twelve billion, six hundred six million, six hundred twenty-one thousand, two hundred five".