643406627 has 2 divisors, whose sum is σ = 643406628. Its totient is φ = 643406626.

The previous prime is 643406593. The next prime is 643406651. The reversal of 643406627 is 726604346.

643406627 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643406627 - 2¹⁴ = 643390243 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (643406677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321703313 + 321703314.

It is an arithmetic number, because the mean of its divisors is an integer number (321703314).

Almost surely, 2^643406627 is an apocalyptic number.

643406627 is a deficient number, since it is larger than the sum of its proper divisors (1).

643406627 is an equidigital number, since it uses as much as digits as its factorization.

643406627 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 38.

The square root of 643406627 is about 25365.4613007530. The cubic root of 643406627 is about 863.3002034397.

The spelling of 643406627 in words is "six hundred forty-three million, four hundred six thousand, six hundred twenty-seven".