205112161171 has 4 divisors (see below), whose sum is σ = 206370518152. Its totient is φ = 203853804192.

The previous prime is 205112161159. The next prime is 205112161213. The reversal of 205112161171 is 171161211502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205112161171 - 2⁵ = 205112161139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205112168171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 629178246 + ... + 629178571.

It is an arithmetic number, because the mean of its divisors is an integer number (51592629538).

Almost surely, 2^205112161171 is an apocalyptic number.

205112161171 is a deficient number, since it is larger than the sum of its proper divisors (1258356981).

205112161171 is a wasteful number, since it uses less digits than its factorization.

205112161171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258356980.

The product of its (nonzero) digits is 840, while the sum is 28.

Adding to 205112161171 its reverse (171161211502), we get a palindrome (376273372673).

The spelling of 205112161171 in words is "two hundred five billion, one hundred twelve million, one hundred sixty-one thousand, one hundred seventy-one".