644301273712 has 20 divisors (see below), whose sum is σ = 1248347131920. Its totient is φ = 322147175168.

The previous prime is 644301273709. The next prime is 644301273739. The reversal of 644301273712 is 217372103446.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 2019048 + ... + 2316280.

It is an arithmetic number, because the mean of its divisors is an integer number (62417356596).

Almost surely, 2^644301273712 is an apocalyptic number.

It is an amenable number.

644301273712 is a deficient number, since it is larger than the sum of its proper divisors (604045858208).

644301273712 is a wasteful number, since it uses less digits than its factorization.

644301273712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432720 (or 432714 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 40.

The spelling of 644301273712 in words is "six hundred forty-four billion, three hundred one million, two hundred seventy-three thousand, seven hundred twelve".