206655612171 has 4 divisors (see below), whose sum is σ = 275540816232. Its totient is φ = 137770408112.

The previous prime is 206655612169. The next prime is 206655612179. The reversal of 206655612171 is 171216556602.

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 206655612171 - 2¹ = 206655612169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206655612179) 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, 34442602026 + ... + 34442602031.

It is an arithmetic number, because the mean of its divisors is an integer number (68885204058).

Almost surely, 2^206655612171 is an apocalyptic number.

206655612171 is a deficient number, since it is larger than the sum of its proper divisors (68885204061).

206655612171 is an equidigital number, since it uses as much as digits as its factorization.

206655612171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68885204060.

The product of its (nonzero) digits is 151200, while the sum is 42.

The spelling of 206655612171 in words is "two hundred six billion, six hundred fifty-five million, six hundred twelve thousand, one hundred seventy-one".