205712281165 has 8 divisors (see below), whose sum is σ = 246970590048. Its totient is φ = 164492589840.

The previous prime is 205712281153. The next prime is 205712281193. The reversal of 205712281165 is 561182217502.

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

It is not a de Polignac number, because 205712281165 - 2⁵ = 205712281133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9642667 + ... + 9663976.

It is an arithmetic number, because the mean of its divisors is an integer number (30871323756).

Almost surely, 2^205712281165 is an apocalyptic number.

It is an amenable number.

205712281165 is a deficient number, since it is larger than the sum of its proper divisors (41258308883).

205712281165 is a wasteful number, since it uses less digits than its factorization.

205712281165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19308779.

The product of its (nonzero) digits is 67200, while the sum is 40.

Adding to 205712281165 its reverse (561182217502), we get a palindrome (766894498667).

The spelling of 205712281165 in words is "two hundred five billion, seven hundred twelve million, two hundred eighty-one thousand, one hundred sixty-five".