644330550252 has 24 divisors (see below), whose sum is σ = 1544071409776. Its totient is φ = 208972070208.

The previous prime is 644330550187. The next prime is 644330550301. The reversal of 644330550252 is 252055033446.

644330550252 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 644330550252.

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, 725597023 + ... + 725597910.

Almost surely, 2^644330550252 is an apocalyptic number.

It is an amenable number.

644330550252 is an abundant number, since it is smaller than the sum of its proper divisors (899740859524).

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

644330550252 is a wasteful number, since it uses less digits than its factorization.

644330550252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451194977 (or 1451194975 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 39.

Adding to 644330550252 its reverse (252055033446), we get a palindrome (896385583698).

The spelling of 644330550252 in words is "six hundred forty-four billion, three hundred thirty million, five hundred fifty thousand, two hundred fifty-two".