644644606446446 has 16 divisors (see below), whose sum is σ = 1023847807821984. Its totient is φ = 303362022050304.

The previous prime is 644644606446437. The next prime is 644644606446469.

644644606446446 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106648406 + ... + 112530758.

It is an arithmetic number, because the mean of its divisors is an integer number (63990487988874).

Almost surely, 2^{644644606446446} is an apocalyptic number.

644644606446446 is a deficient number, since it is larger than the sum of its proper divisors (379203201375538).

644644606446446 is a wasteful number, since it uses less digits than its factorization.

644644606446446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9105595.

The product of its (nonzero) digits is 3057647616, while the sum is 68.

The spelling of 644644606446446 in words is "six hundred forty-four trillion, six hundred forty-four billion, six hundred six million, four hundred forty-six thousand, four hundred forty-six".