205116665 has 16 divisors (see below), whose sum is σ = 271242048. Its totient is φ = 147946176.

The previous prime is 205116661. The next prime is 205116671. The reversal of 205116665 is 566611502.

It is a cyclic number.

It is not a de Polignac number, because 205116665 - 2² = 205116661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205116661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33899 + ... + 39488.

It is an arithmetic number, because the mean of its divisors is an integer number (16952628).

Almost surely, 2^205116665 is an apocalyptic number.

It is an amenable number.

205116665 is a deficient number, since it is larger than the sum of its proper divisors (66125383).

205116665 is a wasteful number, since it uses less digits than its factorization.

205116665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73448.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 205116665 is about 14321.8946023213. The cubic root of 205116665 is about 589.7486864170.

The spelling of 205116665 in words is "two hundred five million, one hundred sixteen thousand, six hundred sixty-five".