643223322319 has 2 divisors, whose sum is σ = 643223322320. Its totient is φ = 643223322318.

The previous prime is 643223322283. The next prime is 643223322347. The reversal of 643223322319 is 913223322346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643223322319 - 2³³ = 634633387727 is a prime.

It is a super-2 number, since 2×643223322319² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643223322359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321611661159 + 321611661160.

It is an arithmetic number, because the mean of its divisors is an integer number (321611661160).

Almost surely, 2^643223322319 is an apocalyptic number.

643223322319 is a deficient number, since it is larger than the sum of its proper divisors (1).

643223322319 is an equidigital number, since it uses as much as digits as its factorization.

643223322319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 40.

The spelling of 643223322319 in words is "six hundred forty-three billion, two hundred twenty-three million, three hundred twenty-two thousand, three hundred nineteen".