205052172005 has 8 divisors (see below), whose sum is σ = 246081893400. Its totient is φ = 164028879616.

The previous prime is 205052171969. The next prime is 205052172019. The reversal of 205052172005 is 500271250502.

It can be written as a sum of positive squares in 4 ways, for example, as 471454369 + 204580717636 = 21713^2 + 452306^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 205052172005 - 2⁸ = 205052171749 is a prime.

It is a Curzon 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, 1536800 + ... + 1664889.

It is an arithmetic number, because the mean of its divisors is an integer number (30760236675).

Almost surely, 2^205052172005 is an apocalyptic number.

It is an amenable number.

205052172005 is a deficient number, since it is larger than the sum of its proper divisors (41029721395).

205052172005 is a wasteful number, since it uses less digits than its factorization.

205052172005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3214503.

The product of its (nonzero) digits is 7000, while the sum is 29.

The spelling of 205052172005 in words is "two hundred five billion, fifty-two million, one hundred seventy-two thousand, five".