644412392312 has 16 divisors (see below), whose sum is σ = 1301217330840. Its totient is φ = 297421104096.

The previous prime is 644412392263. The next prime is 644412392329. The reversal of 644412392312 is 213293214446.

It is a self number, because there is not a number n which added to its sum of digits gives 644412392312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3098136398 + ... + 3098136605.

Almost surely, 2^644412392312 is an apocalyptic number.

It is an amenable number.

644412392312 is an abundant number, since it is smaller than the sum of its proper divisors (656804938528).

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

644412392312 is a wasteful number, since it uses less digits than its factorization.

644412392312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6196273022 (or 6196273018 counting only the distinct ones).

The product of its digits is 248832, while the sum is 41.

The spelling of 644412392312 in words is "six hundred forty-four billion, four hundred twelve million, three hundred ninety-two thousand, three hundred twelve".