643884488341 has 2 divisors, whose sum is σ = 643884488342. Its totient is φ = 643884488340.

The previous prime is 643884488309. The next prime is 643884488371. The reversal of 643884488341 is 143884488346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 512734763025 + 131149725316 = 716055^2 + 362146^2 .

It is a cyclic number.

It is not a de Polignac number, because 643884488341 - 2⁵ = 643884488309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643884488341.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643884488371) 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, 321942244170 + 321942244171.

It is an arithmetic number, because the mean of its divisors is an integer number (321942244171).

Almost surely, 2^643884488341 is an apocalyptic number.

It is an amenable number.

643884488341 is a deficient number, since it is larger than the sum of its proper divisors (1).

643884488341 is an equidigital number, since it uses as much as digits as its factorization.

643884488341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56623104, while the sum is 61.

The spelling of 643884488341 in words is "six hundred forty-three billion, eight hundred eighty-four million, four hundred eighty-eight thousand, three hundred forty-one".