12644381456 has 40 divisors (see below), whose sum is σ = 28286939520. Its totient is φ = 5363149824.

The previous prime is 12644381381. The next prime is 12644381461. The reversal of 12644381456 is 65418344621.

12644381456 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 571076 + ... + 592803.

It is an arithmetic number, because the mean of its divisors is an integer number (707173488).

Almost surely, 2^12644381456 is an apocalyptic number.

12644381456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12644381456 is an abundant number, since it is smaller than the sum of its proper divisors (15642558064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12644381456 is a wasteful number, since it uses less digits than its factorization.

12644381456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163991 (or 1163985 counting only the distinct ones).

The product of its digits is 552960, while the sum is 44.

The spelling of 12644381456 in words is "twelve billion, six hundred forty-four million, three hundred eighty-one thousand, four hundred fifty-six".