643104430243 has 4 divisors (see below), whose sum is σ = 701568469368. Its totient is φ = 584640391120.

The previous prime is 643104430207. The next prime is 643104430253. The reversal of 643104430243 is 342034401346.

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 643104430243 - 2²⁹ = 642567559331 is a prime.

It is a super-3 number, since 3×643104430243³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643104430199 and 643104430208.

It is not an unprimeable number, because it can be changed into a prime (643104430253) 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, 29232019546 + ... + 29232019567.

It is an arithmetic number, because the mean of its divisors is an integer number (175392117342).

Almost surely, 2^643104430243 is an apocalyptic number.

643104430243 is a deficient number, since it is larger than the sum of its proper divisors (58464039125).

643104430243 is a wasteful number, since it uses less digits than its factorization.

643104430243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58464039124.

The product of its (nonzero) digits is 82944, while the sum is 34.

Adding to 643104430243 its reverse (342034401346), we get a palindrome (985138831589).

The spelling of 643104430243 in words is "six hundred forty-three billion, one hundred four million, four hundred thirty thousand, two hundred forty-three".