205065500071986 has 12 divisors (see below), whose sum is σ = 444308583489342. Its totient is φ = 68355166690656.

The previous prime is 205065500071981. The next prime is 205065500071987. The reversal of 205065500071986 is 689170005560502.

205065500071986 is a `hidden beast` number, since 2 + 0 + 5 + 0 + 6 + 550 + 0 + 0 + 7 + 1 + 9 + 86 = 666.

It can be written as a sum of positive squares in only one way, i.e., 204194983081761 + 870516990225 = 14289681^2 + 933015^2 .

It is not an unprimeable number, because it can be changed into a prime (205065500071981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5696263890871 + ... + 5696263890906.

Almost surely, 2^{205065500071986} is an apocalyptic number.

205065500071986 is an abundant number, since it is smaller than the sum of its proper divisors (239243083417356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205065500071986 is a wasteful number, since it uses less digits than its factorization.

205065500071986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11392527781785 (or 11392527781782 counting only the distinct ones).

The product of its (nonzero) digits is 4536000, while the sum is 54.

The spelling of 205065500071986 in words is "two hundred five trillion, sixty-five billion, five hundred million, seventy-one thousand, nine hundred eighty-six".