644484510664288 has 192 divisors, whose sum is σ = 1554100949173248. Its totient is φ = 257046902323200.

The previous prime is 644484510664193. The next prime is 644484510664297. The reversal of 644484510664288 is 882466015484446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5411183938 + ... + 5411303038.

It is an arithmetic number, because the mean of its divisors is an integer number (8094275776944).

Almost surely, 2^{644484510664288} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 644484510664288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (777050474586624).

644484510664288 is an abundant number, since it is smaller than the sum of its proper divisors (909616438508960).

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

644484510664288 is a wasteful number, since it uses less digits than its factorization.

644484510664288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147565 (or 147557 counting only the distinct ones).

The product of its (nonzero) digits is 1132462080, while the sum is 70.

The spelling of 644484510664288 in words is "six hundred forty-four trillion, four hundred eighty-four billion, five hundred ten million, six hundred sixty-four thousand, two hundred eighty-eight".