12781325779 has 4 divisors (see below), whose sum is σ = 12784782960. Its totient is φ = 12777868600.

The previous prime is 12781325771. The next prime is 12781325807. The reversal of 12781325779 is 97752318721.

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

It is a cyclic number.

It is not a de Polignac number, because 12781325779 - 2³ = 12781325771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12781325771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1723039 + ... + 1730440.

It is an arithmetic number, because the mean of its divisors is an integer number (3196195740).

Almost surely, 2^12781325779 is an apocalyptic number.

12781325779 is a deficient number, since it is larger than the sum of its proper divisors (3457181).

12781325779 is an equidigital number, since it uses as much as digits as its factorization.

12781325779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3457180.

The product of its digits is 1481760, while the sum is 52.

The spelling of 12781325779 in words is "twelve billion, seven hundred eighty-one million, three hundred twenty-five thousand, seven hundred seventy-nine".