644523545325446 has 32 divisors (see below), whose sum is σ = 1049611592517120. Its totient is φ = 295846404588000.

The previous prime is 644523545325419. The next prime is 644523545325449.

644523545325446 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 (644523545325449) 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, 1786331720 + ... + 1786692491.

It is an arithmetic number, because the mean of its divisors is an integer number (32800362266160).

Almost surely, 2^{644523545325446} is an apocalyptic number.

644523545325446 is a deficient number, since it is larger than the sum of its proper divisors (405088047191674).

644523545325446 is a wasteful number, since it uses less digits than its factorization.

644523545325446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3573024380.

The product of its digits is 829440000, while the sum is 62.

The spelling of 644523545325446 in words is "six hundred forty-four trillion, five hundred twenty-three billion, five hundred forty-five million, three hundred twenty-five thousand, four hundred forty-six".