12641287809 has 4 divisors (see below), whose sum is σ = 16855050416. Its totient is φ = 8427525204.

The previous prime is 12641287793. The next prime is 12641287817. The reversal of 12641287809 is 90878214621.

It is a happy number.

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 not a de Polignac number, because 12641287809 - 2⁴ = 12641287793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12641287409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2106881299 + ... + 2106881304.

It is an arithmetic number, because the mean of its divisors is an integer number (4213762604).

Almost surely, 2^12641287809 is an apocalyptic number.

It is an amenable number.

12641287809 is a deficient number, since it is larger than the sum of its proper divisors (4213762607).

12641287809 is an equidigital number, since it uses as much as digits as its factorization.

12641287809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4213762606.

The product of its (nonzero) digits is 387072, while the sum is 48.

The spelling of 12641287809 in words is "twelve billion, six hundred forty-one million, two hundred eighty-seven thousand, eight hundred nine".