643225065 has 64 divisors (see below), whose sum is σ = 1199480832. Its totient is φ = 288288000.

The previous prime is 643225027. The next prime is 643225087. The reversal of 643225065 is 560522346.

It is not a de Polignac number, because 643225065 - 2¹⁹ = 642700777 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1389024 + ... + 1389486.

It is an arithmetic number, because the mean of its divisors is an integer number (18741888).

Almost surely, 2^643225065 is an apocalyptic number.

It is an amenable number.

643225065 is a deficient number, since it is larger than the sum of its proper divisors (556255767).

643225065 is a wasteful number, since it uses less digits than its factorization.

643225065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710.

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 643225065 is about 25361.8821265300. The cubic root of 643225065 is about 863.2189913151.

The spelling of 643225065 in words is "six hundred forty-three million, two hundred twenty-five thousand, sixty-five".