12560891909 has 4 divisors (see below), whose sum is σ = 12561255840. Its totient is φ = 12560527980.

The previous prime is 12560891899. The next prime is 12560891929. The reversal of 12560891909 is 90919806521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12560891909 - 2¹⁶ = 12560826373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12560891929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124049 + ... + 201270.

It is an arithmetic number, because the mean of its divisors is an integer number (3140313960).

Almost surely, 2^12560891909 is an apocalyptic number.

It is an amenable number.

12560891909 is a deficient number, since it is larger than the sum of its proper divisors (363931).

12560891909 is an equidigital number, since it uses as much as digits as its factorization.

12560891909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363930.

The product of its (nonzero) digits is 349920, while the sum is 50.

The spelling of 12560891909 in words is "twelve billion, five hundred sixty million, eight hundred ninety-one thousand, nine hundred nine".