205864102065 has 8 divisors (see below), whose sum is σ = 329382563328. Its totient is φ = 109794187760.

The previous prime is 205864102057. The next prime is 205864102091. The reversal of 205864102065 is 560201468502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 205864102065 - 2³ = 205864102057 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6862136721 + ... + 6862136750.

It is an arithmetic number, because the mean of its divisors is an integer number (41172820416).

Almost surely, 2^205864102065 is an apocalyptic number.

It is an amenable number.

205864102065 is a deficient number, since it is larger than the sum of its proper divisors (123518461263).

205864102065 is a wasteful number, since it uses less digits than its factorization.

205864102065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13724273479.

The product of its (nonzero) digits is 115200, while the sum is 39.

The spelling of 205864102065 in words is "two hundred five billion, eight hundred sixty-four million, one hundred two thousand, sixty-five".