643884488371 has 2 divisors, whose sum is σ = 643884488372. Its totient is φ = 643884488370.

The previous prime is 643884488341. The next prime is 643884488407. The reversal of 643884488371 is 173884488346.

643884488371 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643884488371 - 2¹⁵ = 643884455603 is a prime.

It is not a weakly prime, because it can be changed into another prime (643884488341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321942244185 + 321942244186.

It is an arithmetic number, because the mean of its divisors is an integer number (321942244186).

Almost surely, 2^643884488371 is an apocalyptic number.

643884488371 is a deficient number, since it is larger than the sum of its proper divisors (1).

643884488371 is an equidigital number, since it uses as much as digits as its factorization.

643884488371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 99090432, while the sum is 64.

The spelling of 643884488371 in words is "six hundred forty-three billion, eight hundred eighty-four million, four hundred eighty-eight thousand, three hundred seventy-one".