643511354560 has 56 divisors (see below), whose sum is σ = 1534920069600. Its totient is φ = 256974741504.

The previous prime is 643511354557. The next prime is 643511354569. The reversal of 643511354560 is 65453115346.

It is not an unprimeable number, because it can be changed into a prime (643511354569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1486929 + ... + 1870288.

Almost surely, 2^643511354560 is an apocalyptic number.

It is an amenable number.

643511354560 is an abundant number, since it is smaller than the sum of its proper divisors (891408715040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643511354560 is a wasteful number, since it uses less digits than its factorization.

643511354560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3357833 (or 3357823 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 643511354560 in words is "six hundred forty-three billion, five hundred eleven million, three hundred fifty-four thousand, five hundred sixty".