206506161 has 6 divisors (see below), whose sum is σ = 298286690. Its totient is φ = 137670768.

The previous prime is 206506151. The next prime is 206506169. The reversal of 206506161 is 161605602.

It is a happy number.

206506161 is a `hidden beast` number, since 2 + 0 + 650 + 6 + 1 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 112784400 + 93721761 = 10620^2 + 9681^2 .

It is not a de Polignac number, because 206506161 - 2⁷ = 206506033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206506169) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11472556 + ... + 11472573.

Almost surely, 2^206506161 is an apocalyptic number.

It is an amenable number.

206506161 is a deficient number, since it is larger than the sum of its proper divisors (91780529).

206506161 is a wasteful number, since it uses less digits than its factorization.

206506161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22945135 (or 22945132 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 206506161 is about 14370.3222302076. The cubic root of 206506161 is about 591.0773774164.

The spelling of 206506161 in words is "two hundred six million, five hundred six thousand, one hundred sixty-one".