12786481709 has 4 divisors (see below), whose sum is σ = 12843820416. Its totient is φ = 12729143004.

The previous prime is 12786481693. The next prime is 12786481717. The reversal of 12786481709 is 90718468721.

It is a happy number.

12786481709 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 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 12786481709 - 2⁴ = 12786481693 is a prime.

It is a super-2 number, since 2×12786481709² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12786481759) by changing a digit.

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, 28669019 + ... + 28669464.

It is an arithmetic number, because the mean of its divisors is an integer number (3210955104).

Almost surely, 2^12786481709 is an apocalyptic number.

It is an amenable number.

12786481709 is a deficient number, since it is larger than the sum of its proper divisors (57338707).

12786481709 is an equidigital number, since it uses as much as digits as its factorization.

12786481709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57338706.

The product of its (nonzero) digits is 1354752, while the sum is 53.

The spelling of 12786481709 in words is "twelve billion, seven hundred eighty-six million, four hundred eighty-one thousand, seven hundred nine".