643134565 has 16 divisors (see below), whose sum is σ = 817756992. Its totient is φ = 483888384.

The previous prime is 643134517. The next prime is 643134571. The reversal of 643134565 is 565431346.

643134565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 643134565 - 2⁹ = 643134053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 208162 + ... + 211228.

It is an arithmetic number, because the mean of its divisors is an integer number (51109812).

Almost surely, 2^643134565 is an apocalyptic number.

It is an amenable number.

643134565 is a deficient number, since it is larger than the sum of its proper divisors (174622427).

643134565 is a wasteful number, since it uses less digits than its factorization.

643134565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5556.

The product of its digits is 129600, while the sum is 37.

The square root of 643134565 is about 25360.0978901896. The cubic root of 643134565 is about 863.1785052359.

The spelling of 643134565 in words is "six hundred forty-three million, one hundred thirty-four thousand, five hundred sixty-five".