644438264514 has 32 divisors (see below), whose sum is σ = 1432576321344. Its totient is φ = 191599711680.

The previous prime is 644438264507. The next prime is 644438264551. The reversal of 644438264514 is 415462834446.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92111749 + ... + 92118744.

It is an arithmetic number, because the mean of its divisors is an integer number (44768010042).

Almost surely, 2^644438264514 is an apocalyptic number.

644438264514 is an abundant number, since it is smaller than the sum of its proper divisors (788138056830).

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

644438264514 is a wasteful number, since it uses less digits than its factorization.

644438264514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184230562.

The product of its digits is 8847360, while the sum is 51.

The spelling of 644438264514 in words is "six hundred forty-four billion, four hundred thirty-eight million, two hundred sixty-four thousand, five hundred fourteen".