644022445422 has 16 divisors (see below), whose sum is σ = 1288145445840. Its totient is φ = 214657389312.

The previous prime is 644022445373. The next prime is 644022445433. The reversal of 644022445422 is 224544220446.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4106403 + ... + 4260350.

It is an arithmetic number, because the mean of its divisors is an integer number (80509090365).

Almost surely, 2^644022445422 is an apocalyptic number.

644022445422 is an abundant number, since it is smaller than the sum of its proper divisors (644123000418).

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

644022445422 is a wasteful number, since it uses less digits than its factorization.

644022445422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8379587.

The product of its (nonzero) digits is 491520, while the sum is 39.

Adding to 644022445422 its reverse (224544220446), we get a palindrome (868566665868).

The spelling of 644022445422 in words is "six hundred forty-four billion, twenty-two million, four hundred forty-five thousand, four hundred twenty-two".