644495594446 has 64 divisors (see below), whose sum is σ = 1104635750400. Its totient is φ = 279357206400.

The previous prime is 644495594389. The next prime is 644495594447.

644495594446 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 (644495594447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22005100 + ... + 22034368.

It is an arithmetic number, because the mean of its divisors is an integer number (17259933600).

Almost surely, 2^644495594446 is an apocalyptic number.

644495594446 is a deficient number, since it is larger than the sum of its proper divisors (460140155954).

644495594446 is a wasteful number, since it uses less digits than its factorization.

644495594446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29785.

The product of its digits is 298598400, while the sum is 64.

The spelling of 644495594446 in words is "six hundred forty-four billion, four hundred ninety-five million, five hundred ninety-four thousand, four hundred forty-six".