12566914457 has 4 divisors (see below), whose sum is σ = 12574269540. Its totient is φ = 12559559376.

The previous prime is 12566914453. The next prime is 12566914463. The reversal of 12566914457 is 75441966521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75441966521 = 283 ⋅266579387.

It can be written as a sum of positive squares in 2 ways, for example, as 7614133081 + 4952781376 = 87259^2 + 70376^2 .

It is a cyclic number.

It is not a de Polignac number, because 12566914457 - 2² = 12566914453 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12566914453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3674978 + ... + 3678395.

It is an arithmetic number, because the mean of its divisors is an integer number (3143567385).

Almost surely, 2^12566914457 is an apocalyptic number.

It is an amenable number.

12566914457 is a deficient number, since it is larger than the sum of its proper divisors (7355083).

12566914457 is an equidigital number, since it uses as much as digits as its factorization.

12566914457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7355082.

The product of its digits is 1814400, while the sum is 50.

The spelling of 12566914457 in words is "twelve billion, five hundred sixty-six million, nine hundred fourteen thousand, four hundred fifty-seven".