644224422446 has 32 divisors (see below), whose sum is σ = 1075938316128. Its totient is φ = 286805975040.

The previous prime is 644224422397. The next prime is 644224422463.

644224422446 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 644224422397 and 644224422406.

It is a congruent number.

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, 194006 + ... + 1151558.

It is an arithmetic number, because the mean of its divisors is an integer number (33623072379).

Almost surely, 2^644224422446 is an apocalyptic number.

644224422446 is a deficient number, since it is larger than the sum of its proper divisors (431713893682).

644224422446 is a wasteful number, since it uses less digits than its factorization.

644224422446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958196.

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

The spelling of 644224422446 in words is "six hundred forty-four billion, two hundred twenty-four million, four hundred twenty-two thousand, four hundred forty-six".