12508956913 has 4 divisors (see below), whose sum is σ = 12512324160. Its totient is φ = 12505589668.

The previous prime is 12508956877. The next prime is 12508956923. The reversal of 12508956913 is 31965980521.

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 12508956913 - 2⁹ = 12508956401 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12508956923) 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, 1678045 + ... + 1685482.

It is an arithmetic number, because the mean of its divisors is an integer number (3128081040).

Almost surely, 2^12508956913 is an apocalyptic number.

It is an amenable number.

12508956913 is a deficient number, since it is larger than the sum of its proper divisors (3367247).

12508956913 is an equidigital number, since it uses as much as digits as its factorization.

12508956913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3367246.

The product of its (nonzero) digits is 583200, while the sum is 49.

The spelling of 12508956913 in words is "twelve billion, five hundred eight million, nine hundred fifty-six thousand, nine hundred thirteen".