644573323375446 has 16 divisors (see below), whose sum is σ = 1289729180282544. Its totient is φ = 214760685536544.

The previous prime is 644573323375433. The next prime is 644573323375469.

644573323375446 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, 24272216101 + ... + 24272242656.

It is an arithmetic number, because the mean of its divisors is an integer number (80608073767659).

Almost surely, 2^{644573323375446} is an apocalyptic number.

644573323375446 is an abundant number, since it is smaller than the sum of its proper divisors (645155856907098).

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

644573323375446 is a wasteful number, since it uses less digits than its factorization.

644573323375446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48544460975.

The product of its digits is 1828915200, while the sum is 66.

The spelling of 644573323375446 in words is "six hundred forty-four trillion, five hundred seventy-three billion, three hundred twenty-three million, three hundred seventy-five thousand, four hundred forty-six".