206066605 has 16 divisors (see below), whose sum is σ = 270857520. Its totient is φ = 149804032.

The previous prime is 206066603. The next prime is 206066629. The reversal of 206066605 is 506660602.

It can be written as a sum of positive squares in 8 ways, for example, as 2319529 + 203747076 = 1523^2 + 14274^2 .

It is a cyclic number.

It is not a de Polignac number, because 206066605 - 2¹ = 206066603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206066603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39334 + ... + 44263.

It is an arithmetic number, because the mean of its divisors is an integer number (16928595).

Almost surely, 2^206066605 is an apocalyptic number.

It is an amenable number.

206066605 is a deficient number, since it is larger than the sum of its proper divisors (64790915).

206066605 is a wasteful number, since it uses less digits than its factorization.

206066605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83648.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 206066605 is about 14355.0202020060. The cubic root of 206066605 is about 590.6577028261.

The spelling of 206066605 in words is "two hundred six million, sixty-six thousand, six hundred five".