644044440446 has 24 divisors (see below), whose sum is σ = 1064272110552. Its totient is φ = 292086594800.

The previous prime is 644044440421. The next prime is 644044440451.

644044440446 is nontrivially palindromic in base 10.

644044440446 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 644044440397 and 644044440406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2896565 + ... + 3110976.

It is an arithmetic number, because the mean of its divisors is an integer number (44344671273).

Almost surely, 2^644044440446 is an apocalyptic number.

644044440446 is a deficient number, since it is larger than the sum of its proper divisors (420227670106).

644044440446 is a wasteful number, since it uses less digits than its factorization.

644044440446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6008008 (or 6007997 counting only the distinct ones).

The product of its (nonzero) digits is 2359296, while the sum is 44.

The spelling of 644044440446 in words is "six hundred forty-four billion, forty-four million, four hundred forty thousand, four hundred forty-six".