204615212065 has 32 divisors (see below), whose sum is σ = 283762258560. Its totient is φ = 139985433600.

The previous prime is 204615212059. The next prime is 204615212083. The reversal of 204615212065 is 560212516402.

It is not a de Polignac number, because 204615212065 - 2⁵ = 204615212033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204615212065.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1795075 + ... + 1905655.

It is an arithmetic number, because the mean of its divisors is an integer number (8867570580).

Almost surely, 2^204615212065 is an apocalyptic number.

It is an amenable number.

204615212065 is a deficient number, since it is larger than the sum of its proper divisors (79147046495).

204615212065 is a wasteful number, since it uses less digits than its factorization.

204615212065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112593.

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 204615212065 its reverse (560212516402), we get a palindrome (764827728467).

The spelling of 204615212065 in words is "two hundred four billion, six hundred fifteen million, two hundred twelve thousand, sixty-five".