643270065 has 8 divisors (see below), whose sum is σ = 1029232128. Its totient is φ = 343077360.

The previous prime is 643270051. The next prime is 643270109. The reversal of 643270065 is 560072346.

643270065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 643270065 - 2²⁷ = 509052337 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21442321 + ... + 21442350.

It is an arithmetic number, because the mean of its divisors is an integer number (128654016).

Almost surely, 2^643270065 is an apocalyptic number.

It is an amenable number.

643270065 is a deficient number, since it is larger than the sum of its proper divisors (385962063).

643270065 is a wasteful number, since it uses less digits than its factorization.

643270065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42884679.

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 643270065 is about 25362.7692691472. The cubic root of 643270065 is about 863.2391211012.

The spelling of 643270065 in words is "six hundred forty-three million, two hundred seventy thousand, sixty-five".