643243010099 has 2 divisors, whose sum is σ = 643243010100. Its totient is φ = 643243010098.

The previous prime is 643243010009. The next prime is 643243010203. The reversal of 643243010099 is 990010342346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643243010099 - 2²⁸ = 642974574643 is a prime.

It is not a weakly prime, because it can be changed into another prime (643243010009) 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 as a sum of consecutive naturals, namely, 321621505049 + 321621505050.

It is an arithmetic number, because the mean of its divisors is an integer number (321621505050).

Almost surely, 2^643243010099 is an apocalyptic number.

643243010099 is a deficient number, since it is larger than the sum of its proper divisors (1).

643243010099 is an equidigital number, since it uses as much as digits as its factorization.

643243010099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 41.

The spelling of 643243010099 in words is "six hundred forty-three billion, two hundred forty-three million, ten thousand, ninety-nine".