644459954446 has 96 divisors (see below), whose sum is σ = 1257560385984. Its totient is φ = 242310182400.

The previous prime is 644459954429. The next prime is 644459954471.

644459954446 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5417866 + ... + 5535538.

It is an arithmetic number, because the mean of its divisors is an integer number (13099587354).

Almost surely, 2^644459954446 is an apocalyptic number.

644459954446 is a deficient number, since it is larger than the sum of its proper divisors (613100431538).

644459954446 is a wasteful number, since it uses less digits than its factorization.

644459954446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117818 (or 117807 counting only the distinct ones).

The product of its digits is 298598400, while the sum is 64.

The spelling of 644459954446 in words is "six hundred forty-four billion, four hundred fifty-nine million, nine hundred fifty-four thousand, four hundred forty-six".