643432343 has 2 divisors, whose sum is σ = 643432344. Its totient is φ = 643432342.

The previous prime is 643432333. The next prime is 643432357. The reversal of 643432343 is 343234346.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643432343 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643432313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321716171 + 321716172.

It is an arithmetic number, because the mean of its divisors is an integer number (321716172).

Almost surely, 2^643432343 is an apocalyptic number.

643432343 is a deficient number, since it is larger than the sum of its proper divisors (1).

643432343 is an equidigital number, since it uses as much as digits as its factorization.

643432343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 32.

The square root of 643432343 is about 25365.9682054520. The cubic root of 643432343 is about 863.3117048922.

Adding to 643432343 its reverse (343234346), we get a palindrome (986666689).

The spelling of 643432343 in words is "six hundred forty-three million, four hundred thirty-two thousand, three hundred forty-three".