643326623345 has 8 divisors (see below), whose sum is σ = 882276512064. Its totient is φ = 441138255984.

The previous prime is 643326623339. The next prime is 643326623377. The reversal of 643326623345 is 543326623346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 643326623345 - 2²⁶ = 643259514481 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 643326623345.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9190380299 + ... + 9190380368.

It is an arithmetic number, because the mean of its divisors is an integer number (110284564008).

Almost surely, 2^643326623345 is an apocalyptic number.

It is an amenable number.

643326623345 is a deficient number, since it is larger than the sum of its proper divisors (238949888719).

643326623345 is a wasteful number, since it uses less digits than its factorization.

643326623345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18380760679.

The product of its digits is 5598720, while the sum is 47.

Subtracting from 643326623345 its reverse (543326623346), we obtain a palindrome (99999999999).

The spelling of 643326623345 in words is "six hundred forty-three billion, three hundred twenty-six million, six hundred twenty-three thousand, three hundred forty-five".