644223341144214 has 192 divisors, whose sum is σ = 1642063873538880. Its totient is φ = 186485877227520.

The previous prime is 644223341144203. The next prime is 644223341144219. The reversal of 644223341144214 is 412441143322446.

644223341144214 is a `hidden beast` number, since 6 + 4 + 4 + 223 + 3 + 411 + 4 + 4 + 2 + 1 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 644223341144214.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644223341144219) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 377851054 + ... + 379552190.

It is an arithmetic number, because the mean of its divisors is an integer number (8552416008015).

Almost surely, 2^{644223341144214} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 644223341144214, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (821031936769440).

644223341144214 is an abundant number, since it is smaller than the sum of its proper divisors (997840532394666).

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

644223341144214 is a wasteful number, since it uses less digits than its factorization.

644223341144214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703632 (or 1703613 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 45.

The spelling of 644223341144214 in words is "six hundred forty-four trillion, two hundred twenty-three billion, three hundred forty-one million, one hundred forty-four thousand, two hundred fourteen".