12645032447 has 4 divisors (see below), whose sum is σ = 12646319496. Its totient is φ = 12643745400.

The previous prime is 12645032443. The next prime is 12645032453. The reversal of 12645032447 is 74423054621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74423054621 = 9901 ⋅7516721.

It is a cyclic number.

It is not a de Polignac number, because 12645032447 - 2² = 12645032443 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 12645032447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12645032443) 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 in 3 ways as a sum of consecutive naturals, for example, 628673 + ... + 648474.

It is an arithmetic number, because the mean of its divisors is an integer number (3161579874).

Almost surely, 2^12645032447 is an apocalyptic number.

12645032447 is a deficient number, since it is larger than the sum of its proper divisors (1287049).

12645032447 is an equidigital number, since it uses as much as digits as its factorization.

12645032447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287048.

The product of its (nonzero) digits is 161280, while the sum is 38.

The spelling of 12645032447 in words is "twelve billion, six hundred forty-five million, thirty-two thousand, four hundred forty-seven".