12644438455 has 8 divisors (see below), whose sum is σ = 16552719504. Its totient is φ = 9195955200.

The previous prime is 12644438431. The next prime is 12644438473. The reversal of 12644438455 is 55483444621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12644438455 - 2⁹ = 12644437943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114949386 + ... + 114949495.

It is an arithmetic number, because the mean of its divisors is an integer number (2069089938).

Almost surely, 2^12644438455 is an apocalyptic number.

12644438455 is a deficient number, since it is larger than the sum of its proper divisors (3908281049).

12644438455 is a wasteful number, since it uses less digits than its factorization.

12644438455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229898897.

The product of its digits is 1843200, while the sum is 46.

The spelling of 12644438455 in words is "twelve billion, six hundred forty-four million, four hundred thirty-eight thousand, four hundred fifty-five".