643034161 has 32 divisors (see below), whose sum is σ = 841383936. Its totient is φ = 476520000.

The previous prime is 643034153. The next prime is 643034177. The reversal of 643034161 is 161430346.

643034161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 643034161 - 2³ = 643034153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643034111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 337311 + ... + 339211.

It is an arithmetic number, because the mean of its divisors is an integer number (26293248).

Almost surely, 2^643034161 is an apocalyptic number.

It is an amenable number.

643034161 is a deficient number, since it is larger than the sum of its proper divisors (198349775).

643034161 is a wasteful number, since it uses less digits than its factorization.

643034161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 643034161 is about 25358.1182464315. The cubic root of 643034161 is about 863.1335840588.

The spelling of 643034161 in words is "six hundred forty-three million, thirty-four thousand, one hundred sixty-one".