12739701809 has 4 divisors (see below), whose sum is σ = 12831354480. Its totient is φ = 12648049140.

The previous prime is 12739701781. The next prime is 12739701811. The reversal of 12739701809 is 90810793721.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90810793721 = 19 ⋅4779515459.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12739701809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12739701839) 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, 45826127 + ... + 45826404.

It is an arithmetic number, because the mean of its divisors is an integer number (3207838620).

Almost surely, 2^12739701809 is an apocalyptic number.

It is an amenable number.

12739701809 is a deficient number, since it is larger than the sum of its proper divisors (91652671).

12739701809 is an equidigital number, since it uses as much as digits as its factorization.

12739701809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91652670.

The product of its (nonzero) digits is 190512, while the sum is 47.

The spelling of 12739701809 in words is "twelve billion, seven hundred thirty-nine million, seven hundred one thousand, eight hundred nine".