643220193568 has 48 divisors (see below), whose sum is σ = 1280287451520. Its totient is φ = 318074848000.

The previous prime is 643220193529. The next prime is 643220193571. The reversal of 643220193568 is 865391022346.

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, 2835123 + ... + 3053581.

It is an arithmetic number, because the mean of its divisors is an integer number (26672655240).

Almost surely, 2^643220193568 is an apocalyptic number.

It is an amenable number.

643220193568 is a deficient number, since it is larger than the sum of its proper divisors (637067257952).

643220193568 is a wasteful number, since it uses less digits than its factorization.

643220193568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219481 (or 219473 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 49.

The spelling of 643220193568 in words is "six hundred forty-three billion, two hundred twenty million, one hundred ninety-three thousand, five hundred sixty-eight".