206656261 has 16 divisors (see below), whose sum is σ = 246062080. Its totient is φ = 169827840.

The previous prime is 206656259. The next prime is 206656273. The reversal of 206656261 is 162656602.

It is not a de Polignac number, because 206656261 - 2¹ = 206656259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206656231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19285 + ... + 28021.

It is an arithmetic number, because the mean of its divisors is an integer number (15378880).

Almost surely, 2^206656261 is an apocalyptic number.

It is an amenable number.

206656261 is a deficient number, since it is larger than the sum of its proper divisors (39405819).

206656261 is a wasteful number, since it uses less digits than its factorization.

206656261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8884.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 206656261 is about 14375.5438505818. The cubic root of 206656261 is about 591.2205518813.

The spelling of 206656261 in words is "two hundred six million, six hundred fifty-six thousand, two hundred sixty-one".