643326623347 has 8 divisors (see below), whose sum is σ = 652514683392. Its totient is φ = 634142094600.

The previous prime is 643326623339. The next prime is 643326623377. The reversal of 643326623347 is 743326623346.

643326623347 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 643326623347 - 2³ = 643326623339 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 643326623347.

It is not an unprimeable number, because it can be changed into a prime (643326623377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514779 + ... + 1245652.

It is an arithmetic number, because the mean of its divisors is an integer number (81564335424).

Almost surely, 2^643326623347 is an apocalyptic number.

643326623347 is a deficient number, since it is larger than the sum of its proper divisors (9188060045).

643326623347 is a wasteful number, since it uses less digits than its factorization.

643326623347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1765649.

The product of its digits is 7838208, while the sum is 49.

Subtracting 643326623347 from its reverse (743326623346), we obtain a palindrome (99999999999).

The spelling of 643326623347 in words is "six hundred forty-three billion, three hundred twenty-six million, six hundred twenty-three thousand, three hundred forty-seven".