12455504456561 has 2 divisors, whose sum is σ = 12455504456562. Its totient is φ = 12455504456560.

The previous prime is 12455504456537. The next prime is 12455504456573. The reversal of 12455504456561 is 16565440555421.

12455504456561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8027135568400 + 4428368888161 = 2833220^2 + 2104369^2 .

It is an emirp because it is prime and its reverse (16565440555421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12455504456561 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12455504456581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6227752228280 + 6227752228281.

It is an arithmetic number, because the mean of its divisors is an integer number (6227752228281).

Almost surely, 2^{12455504456561} is an apocalyptic number.

It is an amenable number.

12455504456561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12455504456561 is an equidigital number, since it uses as much as digits as its factorization.

12455504456561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400000, while the sum is 53.

The spelling of 12455504456561 in words is "twelve trillion, four hundred fifty-five billion, five hundred four million, four hundred fifty-six thousand, five hundred sixty-one".