643513305438 has 12 divisors (see below), whose sum is σ = 1394278828488. Its totient is φ = 214504435140.

The previous prime is 643513305419. The next prime is 643513305439. The reversal of 643513305438 is 834503315346.

It is a happy number.

643513305438 is a `hidden beast` number, since 6 + 435 + 133 + 0 + 54 + 38 = 666.

643513305438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 643513305393 and 643513305402.

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 5 ways as a sum of consecutive naturals, for example, 17875369578 + ... + 17875369613.

It is an arithmetic number, because the mean of its divisors is an integer number (116189902374).

Almost surely, 2^643513305438 is an apocalyptic number.

643513305438 is an abundant number, since it is smaller than the sum of its proper divisors (750765523050).

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

643513305438 is a wasteful number, since it uses less digits than its factorization.

643513305438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35750739199 (or 35750739196 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 45.

The spelling of 643513305438 in words is "six hundred forty-three billion, five hundred thirteen million, three hundred five thousand, four hundred thirty-eight".