12504756649691 has 2 divisors, whose sum is σ = 12504756649692. Its totient is φ = 12504756649690.

The previous prime is 12504756649663. The next prime is 12504756649709. The reversal of 12504756649691 is 19694665740521.

It is a strong prime.

It is an emirp because it is prime and its reverse (19694665740521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12504756649691 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (12504756649601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6252378324845 + 6252378324846.

It is an arithmetic number, because the mean of its divisors is an integer number (6252378324846).

Almost surely, 2^{12504756649691} is an apocalyptic number.

12504756649691 is a deficient number, since it is larger than the sum of its proper divisors (1).

12504756649691 is an equidigital number, since it uses as much as digits as its factorization.

12504756649691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97977600, while the sum is 65.

The spelling of 12504756649691 in words is "twelve trillion, five hundred four billion, seven hundred fifty-six million, six hundred forty-nine thousand, six hundred ninety-one".