12449813809 has 4 divisors (see below), whose sum is σ = 12450159216. Its totient is φ = 12449468404.

The previous prime is 12449813801. The next prime is 12449813843. The reversal of 12449813809 is 90831894421.

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 12449813809 - 2³ = 12449813801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12449813801) 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, 111379 + ... + 193144.

It is an arithmetic number, because the mean of its divisors is an integer number (3112539804).

Almost surely, 2^12449813809 is an apocalyptic number.

It is an amenable number.

12449813809 is a deficient number, since it is larger than the sum of its proper divisors (345407).

12449813809 is an equidigital number, since it uses as much as digits as its factorization.

12449813809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345406.

The product of its (nonzero) digits is 497664, while the sum is 49.

The spelling of 12449813809 in words is "twelve billion, four hundred forty-nine million, eight hundred thirteen thousand, eight hundred nine".