205440065 has 16 divisors (see below), whose sum is σ = 263908800. Its totient is φ = 153058752.

The previous prime is 205440049. The next prime is 205440077. The reversal of 205440065 is 560044502.

It is a cyclic number.

It is not a de Polignac number, because 205440065 - 2⁴ = 205440049 is a prime.

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, 12722 + ... + 23931.

It is an arithmetic number, because the mean of its divisors is an integer number (16494300).

Almost surely, 2^205440065 is an apocalyptic number.

It is an amenable number.

205440065 is a deficient number, since it is larger than the sum of its proper divisors (58468735).

205440065 is a wasteful number, since it uses less digits than its factorization.

205440065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36736.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 205440065 is about 14333.1805612013. The cubic root of 205440065 is about 590.0584687818.

Adding to 205440065 its reverse (560044502), we get a palindrome (765484567).

The spelling of 205440065 in words is "two hundred five million, four hundred forty thousand, sixty-five".