644711841021304 has 32 divisors (see below), whose sum is σ = 1454237235388800. Its totient is φ = 261762702369120.

The previous prime is 644711841021301. The next prime is 644711841021317. The reversal of 644711841021304 is 403120148117446.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644711841021301) by changing a digit.

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, 302966089642 + ... + 302966091769.

It is an arithmetic number, because the mean of its divisors is an integer number (45444913605900).

Almost surely, 2^{644711841021304} is an apocalyptic number.

It is an amenable number.

644711841021304 is an abundant number, since it is smaller than the sum of its proper divisors (809525394367496).

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

644711841021304 is a wasteful number, since it uses less digits than its factorization.

644711841021304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605932181443 (or 605932181439 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 46.

The spelling of 644711841021304 in words is "six hundred forty-four trillion, seven hundred eleven billion, eight hundred forty-one million, twenty-one thousand, three hundred four".