644230332064 has 24 divisors (see below), whose sum is σ = 1383631054848. Its totient is φ = 292831968960.

The previous prime is 644230332041. The next prime is 644230332091. The reversal of 644230332064 is 460233032446.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 915099552 + ... + 915100255.

It is an arithmetic number, because the mean of its divisors is an integer number (57651293952).

Almost surely, 2^644230332064 is an apocalyptic number.

It is an amenable number.

644230332064 is an abundant number, since it is smaller than the sum of its proper divisors (739400722784).

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

644230332064 is a wasteful number, since it uses less digits than its factorization.

644230332064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1830199828 (or 1830199820 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 37.

The spelling of 644230332064 in words is "six hundred forty-four billion, two hundred thirty million, three hundred thirty-two thousand, sixty-four".