644401032044312 has 32 divisors (see below), whose sum is σ = 1219653767552400. Its totient is φ = 319160569380864.

The previous prime is 644401032044221. The next prime is 644401032044381. The reversal of 644401032044312 is 213440230104446.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 24357737 + ... + 43383192.

Almost surely, 2^{644401032044312} is an apocalyptic number.

It is an amenable number.

644401032044312 is a deficient number, since it is larger than the sum of its proper divisors (575252735508088).

644401032044312 is a wasteful number, since it uses less digits than its factorization.

644401032044312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67752155 (or 67752151 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 38.

Adding to 644401032044312 its reverse (213440230104446), we get a palindrome (857841262148758).

The spelling of 644401032044312 in words is "six hundred forty-four trillion, four hundred one billion, thirty-two million, forty-four thousand, three hundred twelve".