206440065 has 96 divisors (see below), whose sum is σ = 409893120. Its totient is φ = 95344128.

The previous prime is 206440051. The next prime is 206440081. The reversal of 206440065 is 560044602.

It is a happy number.

It is not a de Polignac number, because 206440065 - 2⁴ = 206440049 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 901371 + ... + 901599.

It is an arithmetic number, because the mean of its divisors is an integer number (4269720).

Almost surely, 2^206440065 is an apocalyptic number.

It is an amenable number.

206440065 is a deficient number, since it is larger than the sum of its proper divisors (203453055).

206440065 is a wasteful number, since it uses less digits than its factorization.

206440065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 206440065 is about 14368.0223064972. The cubic root of 206440065 is about 591.0143090491.

Adding to 206440065 its reverse (560044602), we get a palindrome (766484667).

The spelling of 206440065 in words is "two hundred six million, four hundred forty thousand, sixty-five".