646323444356 has 24 divisors (see below), whose sum is σ = 1142548554840. Its totient is φ = 319886744832.

The previous prime is 646323444343. The next prime is 646323444359. The reversal of 646323444356 is 653444323646.

It can be written as a sum of positive squares in 4 ways, for example, as 493880050756 + 152443393600 = 702766^2 + 390440^2 .

It is not an unprimeable number, because it can be changed into a prime (646323444359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267131 + ... + 1167906.

It is an arithmetic number, because the mean of its divisors is an integer number (47606189785).

Almost surely, 2^646323444356 is an apocalyptic number.

It is an amenable number.

646323444356 is a deficient number, since it is larger than the sum of its proper divisors (496225110484).

646323444356 is a wasteful number, since it uses less digits than its factorization.

646323444356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436183 (or 1436181 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 50.

The spelling of 646323444356 in words is "six hundred forty-six billion, three hundred twenty-three million, four hundred forty-four thousand, three hundred fifty-six".