643106752843 has 2 divisors, whose sum is σ = 643106752844. Its totient is φ = 643106752842.

The previous prime is 643106752801. The next prime is 643106753041. The reversal of 643106752843 is 348257601346.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643106752843 is a prime.

It is not a weakly prime, because it can be changed into another prime (643106752543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321553376421 + 321553376422.

It is an arithmetic number, because the mean of its divisors is an integer number (321553376422).

Almost surely, 2^643106752843 is an apocalyptic number.

643106752843 is a deficient number, since it is larger than the sum of its proper divisors (1).

643106752843 is an equidigital number, since it uses as much as digits as its factorization.

643106752843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2903040, while the sum is 49.

The spelling of 643106752843 in words is "six hundred forty-three billion, one hundred six million, seven hundred fifty-two thousand, eight hundred forty-three".