644468425332 has 48 divisors (see below), whose sum is σ = 1535859720192. Its totient is φ = 210237711840.

The previous prime is 644468425319. The next prime is 644468425339. The reversal of 644468425332 is 233524864446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644468425339) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10925157 + ... + 10983987.

It is an arithmetic number, because the mean of its divisors is an integer number (31997077504).

Almost surely, 2^644468425332 is an apocalyptic number.

It is an amenable number.

644468425332 is an abundant number, since it is smaller than the sum of its proper divisors (891391294860).

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

644468425332 is a wasteful number, since it uses less digits than its factorization.

644468425332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78308 (or 78306 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 51.

The spelling of 644468425332 in words is "six hundred forty-four billion, four hundred sixty-eight million, four hundred twenty-five thousand, three hundred thirty-two".