12447126517 has 4 divisors (see below), whose sum is σ = 14225287456. Its totient is φ = 10668965580.

The previous prime is 12447126473. The next prime is 12447126529. The reversal of 12447126517 is 71562174421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71562174421 = 251897 ⋅284093.

It is not a de Polignac number, because 12447126517 - 2³¹ = 10299642869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12447126517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12447126557) 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, 889080459 + ... + 889080472.

It is an arithmetic number, because the mean of its divisors is an integer number (3556321864).

Almost surely, 2^12447126517 is an apocalyptic number.

It is an amenable number.

12447126517 is a deficient number, since it is larger than the sum of its proper divisors (1778160939).

12447126517 is an equidigital number, since it uses as much as digits as its factorization.

12447126517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1778160938.

The product of its digits is 94080, while the sum is 40.

The spelling of 12447126517 in words is "twelve billion, four hundred forty-seven million, one hundred twenty-six thousand, five hundred seventeen".