643345255216 has 40 divisors (see below), whose sum is σ = 1255753715904. Its totient is φ = 319280432640.

The previous prime is 643345255207. The next prime is 643345255243. The reversal of 643345255216 is 612552543346.

It is an unprimeable number.

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, 20569446 + ... + 20600698.

Almost surely, 2^643345255216 is an apocalyptic number.

It is an amenable number.

643345255216 is a deficient number, since it is larger than the sum of its proper divisors (612408460688).

643345255216 is a wasteful number, since it uses less digits than its factorization.

643345255216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40789 (or 40783 counting only the distinct ones).

The product of its digits is 2592000, while the sum is 46.

The spelling of 643345255216 in words is "six hundred forty-three billion, three hundred forty-five million, two hundred fifty-five thousand, two hundred sixteen".