644617343716446 has 32 divisors (see below), whose sum is σ = 1365149485479168. Its totient is φ = 202221416073600.

The previous prime is 644617343716441. The next prime is 644617343716501.

644617343716446 is nontrivially palindromic in base 10.

644617343716446 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644617343716441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177507280 + ... + 181102371.

It is an arithmetic number, because the mean of its divisors is an integer number (42660921421224).

Almost surely, 2^{644617343716446} is an apocalyptic number.

644617343716446 is an abundant number, since it is smaller than the sum of its proper divisors (720532141762722).

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

644617343716446 is a wasteful number, since it uses less digits than its factorization.

644617343716446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358627296.

The product of its digits is 585252864, while the sum is 66.

The spelling of 644617343716446 in words is "six hundred forty-four trillion, six hundred seventeen billion, three hundred forty-three million, seven hundred sixteen thousand, four hundred forty-six".