643358843 has 2 divisors, whose sum is σ = 643358844. Its totient is φ = 643358842.

The previous prime is 643358831. The next prime is 643358851. The reversal of 643358843 is 348853346.

643358843 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643358843 - 2⁴ = 643358827 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 643358794 and 643358803.

It is not a weakly prime, because it can be changed into another prime (643358803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321679421 + 321679422.

It is an arithmetic number, because the mean of its divisors is an integer number (321679422).

Almost surely, 2^643358843 is an apocalyptic number.

643358843 is a deficient number, since it is larger than the sum of its proper divisors (1).

643358843 is an equidigital number, since it uses as much as digits as its factorization.

643358843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 44.

The square root of 643358843 is about 25364.5193725408. The cubic root of 643358843 is about 863.2788312849.

The spelling of 643358843 in words is "six hundred forty-three million, three hundred fifty-eight thousand, eight hundred forty-three".