643513305432 has 32 divisors (see below), whose sum is σ = 1643012697600. Its totient is φ = 209940510624.

The previous prime is 643513305419. The next prime is 643513305439. The reversal of 643513305432 is 234503315346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643513305439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285244132 + ... + 285246387.

It is an arithmetic number, because the mean of its divisors is an integer number (51344146800).

Almost surely, 2^643513305432 is an apocalyptic number.

It is an amenable number.

643513305432 is an abundant number, since it is smaller than the sum of its proper divisors (999499392168).

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

643513305432 is a wasteful number, since it uses less digits than its factorization.

643513305432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570490575 (or 570490571 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 39.

The spelling of 643513305432 in words is "six hundred forty-three billion, five hundred thirteen million, three hundred five thousand, four hundred thirty-two".