12566354515523 has 2 divisors, whose sum is σ = 12566354515524. Its totient is φ = 12566354515522.

The previous prime is 12566354515501. The next prime is 12566354515601. The reversal of 12566354515523 is 32551545366521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12566354515523 - 2³⁴ = 12549174646339 is a prime.

It is not a weakly prime, because it can be changed into another prime (12566354515223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6283177257761 + 6283177257762.

It is an arithmetic number, because the mean of its divisors is an integer number (6283177257762).

Almost surely, 2^{12566354515523} is an apocalyptic number.

12566354515523 is a deficient number, since it is larger than the sum of its proper divisors (1).

12566354515523 is an equidigital number, since it uses as much as digits as its factorization.

12566354515523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200000, while the sum is 53.

The spelling of 12566354515523 in words is "twelve trillion, five hundred sixty-six billion, three hundred fifty-four million, five hundred fifteen thousand, five hundred twenty-three".