12512323643 has 4 divisors (see below), whose sum is σ = 12512940168. Its totient is φ = 12511707120.

The previous prime is 12512323639. The next prime is 12512323661. The reversal of 12512323643 is 34632321521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34632321521 = 7 ⋅4947474503.

It is a cyclic number.

It is not a de Polignac number, because 12512323643 - 2² = 12512323639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12512326643) 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, 276746 + ... + 318767.

It is an arithmetic number, because the mean of its divisors is an integer number (3128235042).

Almost surely, 2^12512323643 is an apocalyptic number.

12512323643 is a deficient number, since it is larger than the sum of its proper divisors (616525).

12512323643 is an equidigital number, since it uses as much as digits as its factorization.

12512323643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616524.

The product of its digits is 25920, while the sum is 32.

The spelling of 12512323643 in words is "twelve billion, five hundred twelve million, three hundred twenty-three thousand, six hundred forty-three".