200640065 has 4 divisors (see below), whose sum is σ = 240768084. Its totient is φ = 160512048.

The previous prime is 200640049. The next prime is 200640131. The reversal of 200640065 is 560046002.

200640065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 119333776 + 81306289 = 10924^2 + 9017^2 .

It is a cyclic number.

It is not a de Polignac number, because 200640065 - 2⁴ = 200640049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 200640065.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20064002 + ... + 20064011.

It is an arithmetic number, because the mean of its divisors is an integer number (60192021).

Almost surely, 2^200640065 is an apocalyptic number.

It is an amenable number.

200640065 is a deficient number, since it is larger than the sum of its proper divisors (40128019).

200640065 is an equidigital number, since it uses as much as digits as its factorization.

200640065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40128018.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 200640065 is about 14164.7472621293. The cubic root of 200640065 is about 585.4267371162.

Adding to 200640065 its reverse (560046002), we get a palindrome (760686067).

The spelling of 200640065 in words is "two hundred million, six hundred forty thousand, sixty-five".