643443525344346 has 64 divisors (see below), whose sum is σ = 1357391520000000. Its totient is φ = 202776691807872.

The previous prime is 643443525344341. The next prime is 643443525344357.

643443525344346 is nontrivially palindromic in base 10.

643443525344346 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 643443525344346.

It is not an unprimeable number, because it can be changed into a prime (643443525344341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1378626430 + ... + 1379093078.

It is an arithmetic number, because the mean of its divisors is an integer number (21209242500000).

Almost surely, 2^{643443525344346} is an apocalyptic number.

643443525344346 is an abundant number, since it is smaller than the sum of its proper divisors (713947994655654).

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

643443525344346 is a wasteful number, since it uses less digits than its factorization.

643443525344346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491411.

The product of its digits is 597196800, while the sum is 60.

The spelling of 643443525344346 in words is "six hundred forty-three trillion, four hundred forty-three billion, five hundred twenty-five million, three hundred forty-four thousand, three hundred forty-six".