646444323444646 has 16 divisors (see below), whose sum is σ = 982138837400640. Its totient is φ = 319066361752320.

The previous prime is 646444323444629. The next prime is 646444323444649.

646444323444646 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 (646444323444649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 411907915 + ... + 413474326.

It is an arithmetic number, because the mean of its divisors is an integer number (61383677337540).

Almost surely, 2^{646444323444646} is an apocalyptic number.

646444323444646 is a deficient number, since it is larger than the sum of its proper divisors (335694513955994).

646444323444646 is a wasteful number, since it uses less digits than its factorization.

646444323444646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825387279.

The product of its digits is 1528823808, while the sum is 64.

The spelling of 646444323444646 in words is "six hundred forty-six trillion, four hundred forty-four billion, three hundred twenty-three million, four hundred forty-four thousand, six hundred forty-six".