643346043 has 8 divisors (see below), whose sum is σ = 859957008. Its totient is φ = 427816224.

The previous prime is 643346027. The next prime is 643346051. The reversal of 643346043 is 340643346.

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

It is not a de Polignac number, because 643346043 - 2⁴ = 643346027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643345995 and 643346013.

It is not an unprimeable number, because it can be changed into a prime (643346003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268896 + ... + 271277.

It is an arithmetic number, because the mean of its divisors is an integer number (107494626).

Almost surely, 2^643346043 is an apocalyptic number.

643346043 is a deficient number, since it is larger than the sum of its proper divisors (216610965).

643346043 is a wasteful number, since it uses less digits than its factorization.

643346043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540573.

The product of its (nonzero) digits is 62208, while the sum is 33.

The square root of 643346043 is about 25364.2670503210. The cubic root of 643346043 is about 863.2731061014.

Adding to 643346043 its reverse (340643346), we get a palindrome (983989389).

The spelling of 643346043 in words is "six hundred forty-three million, three hundred forty-six thousand, forty-three".