643321829831359 has 16 divisors (see below), whose sum is σ = 735318277551360. Its totient is φ = 551348717074560.

The previous prime is 643321829831347. The next prime is 643321829831381. The reversal of 643321829831359 is 953138928123346.

It is a cyclic number.

It is not a de Polignac number, because 643321829831359 - 2¹¹ = 643321829829311 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643321829831294 and 643321829831303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643321829837359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4353726039 + ... + 4353873799.

It is an arithmetic number, because the mean of its divisors is an integer number (45957392346960).

Almost surely, 2^{643321829831359} is an apocalyptic number.

643321829831359 is a deficient number, since it is larger than the sum of its proper divisors (91996447720001).

643321829831359 is a wasteful number, since it uses less digits than its factorization.

643321829831359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222510.

The product of its digits is 201553920, while the sum is 67.

The spelling of 643321829831359 in words is "six hundred forty-three trillion, three hundred twenty-one billion, eight hundred twenty-nine million, eight hundred thirty-one thousand, three hundred fifty-nine".