643404230243 has 8 divisors (see below), whose sum is σ = 665601706080. Its totient is φ = 621207496000.

The previous prime is 643404230233. The next prime is 643404230257. The reversal of 643404230243 is 342032404346.

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 643404230243 - 2⁸ = 643404229987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643404230233) 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, 2027618 + ... + 2323368.

It is an arithmetic number, because the mean of its divisors is an integer number (83200213260).

Almost surely, 2^643404230243 is an apocalyptic number.

643404230243 is a deficient number, since it is larger than the sum of its proper divisors (22197475837).

643404230243 is a wasteful number, since it uses less digits than its factorization.

643404230243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370797.

The product of its (nonzero) digits is 165888, while the sum is 35.

Adding to 643404230243 its reverse (342032404346), we get a palindrome (985436634589).

The spelling of 643404230243 in words is "six hundred forty-three billion, four hundred four million, two hundred thirty thousand, two hundred forty-three".