12500000005 has 4 divisors (see below), whose sum is σ = 15000000012. Its totient is φ = 10000000000.

The previous prime is 12499999999. The next prime is 12500000027. The reversal of 12500000005 is 50000000521.

12500000005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9999800001 + 2500200004 = 99999^2 + 50002^2 .

It is not a de Polignac number, because 12500000005 - 2⁷ = 12499999877 is a prime.

It is a Smith number, since the sum of its digits (13) 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 a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1249999996 + ... + 1250000005.

It is an arithmetic number, because the mean of its divisors is an integer number (3750000003).

Almost surely, 2^12500000005 is an apocalyptic number.

It is an amenable number.

12500000005 is a deficient number, since it is larger than the sum of its proper divisors (2500000007).

12500000005 is an equidigital number, since it uses as much as digits as its factorization.

12500000005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2500000006.

The product of its (nonzero) digits is 50, while the sum is 13.

Adding to 12500000005 its reverse (50000000521), we get a palindrome (62500000526).

The spelling of 12500000005 in words is "twelve billion, five hundred million, five", and thus it is an aban number.