12505878611 has 2 divisors, whose sum is σ = 12505878612. Its totient is φ = 12505878610.

The previous prime is 12505878563. The next prime is 12505878617. The reversal of 12505878611 is 11687850521.

It is a strong prime.

It is an emirp because it is prime and its reverse (11687850521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12505878611 is a prime.

It is not a weakly prime, because it can be changed into another prime (12505878617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6252939305 + 6252939306.

It is an arithmetic number, because the mean of its divisors is an integer number (6252939306).

Almost surely, 2^12505878611 is an apocalyptic number.

12505878611 is a deficient number, since it is larger than the sum of its proper divisors (1).

12505878611 is an equidigital number, since it uses as much as digits as its factorization.

12505878611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134400, while the sum is 44.

The spelling of 12505878611 in words is "twelve billion, five hundred five million, eight hundred seventy-eight thousand, six hundred eleven".