12651824509 has 4 divisors (see below), whose sum is σ = 12687066720. Its totient is φ = 12616582300.

The previous prime is 12651824491. The next prime is 12651824539. The reversal of 12651824509 is 90542815621.

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 12651824509 - 2¹¹ = 12651822461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12651824539) 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, 17620567 + ... + 17621284.

It is an arithmetic number, because the mean of its divisors is an integer number (3171766680).

Almost surely, 2^12651824509 is an apocalyptic number.

It is an amenable number.

12651824509 is a deficient number, since it is larger than the sum of its proper divisors (35242211).

12651824509 is an equidigital number, since it uses as much as digits as its factorization.

12651824509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35242210.

The product of its (nonzero) digits is 172800, while the sum is 43.

The spelling of 12651824509 in words is "twelve billion, six hundred fifty-one million, eight hundred twenty-four thousand, five hundred nine".