12816407809 has 4 divisors (see below), whose sum is σ = 13033635120. Its totient is φ = 12599180500.

The previous prime is 12816407803. The next prime is 12816407843. The reversal of 12816407809 is 90870461821.

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: 90870461821 = 59 ⋅1540177319.

It is a cyclic number.

It is not a de Polignac number, because 12816407809 - 2³³ = 4226473217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12816407803) 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, 108613567 + ... + 108613684.

It is an arithmetic number, because the mean of its divisors is an integer number (3258408780).

Almost surely, 2^12816407809 is an apocalyptic number.

It is an amenable number.

12816407809 is a deficient number, since it is larger than the sum of its proper divisors (217227311).

12816407809 is an equidigital number, since it uses as much as digits as its factorization.

12816407809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217227310.

The product of its (nonzero) digits is 193536, while the sum is 46.

The spelling of 12816407809 in words is "twelve billion, eight hundred sixteen million, four hundred seven thousand, eight hundred nine".