643523325343 has 4 divisors (see below), whose sum is σ = 647471321368. Its totient is φ = 639575329320.

The previous prime is 643523325337. The next prime is 643523325421. The reversal of 643523325343 is 343523325346.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 643523325343 - 2²⁹ = 642986454431 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 643523325343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643523325323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1973997768 + ... + 1973998093.

It is an arithmetic number, because the mean of its divisors is an integer number (161867830342).

Almost surely, 2^643523325343 is an apocalyptic number.

643523325343 is a deficient number, since it is larger than the sum of its proper divisors (3947996025).

643523325343 is a wasteful number, since it uses less digits than its factorization.

643523325343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3947996024.

The product of its digits is 2332800, while the sum is 43.

The spelling of 643523325343 in words is "six hundred forty-three billion, five hundred twenty-three million, three hundred twenty-five thousand, three hundred forty-three".