643512332303 has 2 divisors, whose sum is σ = 643512332304. Its totient is φ = 643512332302.

The previous prime is 643512332263. The next prime is 643512332347. The reversal of 643512332303 is 303233215346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643512332303 - 2²⁶ = 643445223439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643512332003) 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, 321756166151 + 321756166152.

It is an arithmetic number, because the mean of its divisors is an integer number (321756166152).

Almost surely, 2^643512332303 is an apocalyptic number.

643512332303 is a deficient number, since it is larger than the sum of its proper divisors (1).

643512332303 is an equidigital number, since it uses as much as digits as its factorization.

643512332303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 35.

Adding to 643512332303 its reverse (303233215346), we get a palindrome (946745547649).

The spelling of 643512332303 in words is "six hundred forty-three billion, five hundred twelve million, three hundred thirty-two thousand, three hundred three".