644348424843446 has 32 divisors (see below), whose sum is σ = 1013195760592896. Its totient is φ = 306975861360000.

The previous prime is 644348424843443. The next prime is 644348424843463.

644348424843446 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644348424843443) 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, 303481640 + ... + 305597451.

It is an arithmetic number, because the mean of its divisors is an integer number (31662367518528).

Almost surely, 2^{644348424843446} is an apocalyptic number.

644348424843446 is a deficient number, since it is larger than the sum of its proper divisors (368847335749450).

644348424843446 is a wasteful number, since it uses less digits than its factorization.

644348424843446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609079388.

The product of its digits is 2717908992, while the sum is 68.

The spelling of 644348424843446 in words is "six hundred forty-four trillion, three hundred forty-eight billion, four hundred twenty-four million, eight hundred forty-three thousand, four hundred forty-six".