644848358834452 has 12 divisors (see below), whose sum is σ = 1128501499433140. Its totient is φ = 322419358996416.

The previous prime is 644848358834447. The next prime is 644848358834467. The reversal of 644848358834452 is 254438853848446.

It can be written as a sum of positive squares in 2 ways, for example, as 374044341731076 + 270804017103376 = 19340226^2 + 16456124^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1204804203 + ... + 1205339314.

Almost surely, 2^{644848358834452} is an apocalyptic number.

It is an amenable number.

644848358834452 is a deficient number, since it is larger than the sum of its proper divisors (483653140598688).

644848358834452 is a wasteful number, since it uses less digits than its factorization.

644848358834452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2410210410 (or 2410210408 counting only the distinct ones).

The product of its digits is 11324620800, while the sum is 76.

The spelling of 644848358834452 in words is "six hundred forty-four trillion, eight hundred forty-eight billion, three hundred fifty-eight million, eight hundred thirty-four thousand, four hundred fifty-two".