205684123171 has 8 divisors (see below), whose sum is σ = 210712986288. Its totient is φ = 200655840000.

The previous prime is 205684123157. The next prime is 205684123213. The reversal of 205684123171 is 171321486502.

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 205684123171 - 2²⁷ = 205549905443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205684123121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 621996 + ... + 893446.

It is an arithmetic number, because the mean of its divisors is an integer number (26339123286).

Almost surely, 2^205684123171 is an apocalyptic number.

205684123171 is a deficient number, since it is larger than the sum of its proper divisors (5028863117).

205684123171 is a wasteful number, since it uses less digits than its factorization.

205684123171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289973.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 205684123171 in words is "two hundred five billion, six hundred eighty-four million, one hundred twenty-three thousand, one hundred seventy-one".