206568236005 has 4 divisors (see below), whose sum is σ = 247881883212. Its totient is φ = 165254588800.

The previous prime is 206568236003. The next prime is 206568236023. The reversal of 206568236005 is 500632865602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 162209979009 + 44358256996 = 402753^2 + 210614^2 .

It is not a de Polignac number, because 206568236005 - 2¹ = 206568236003 is a prime.

It is a super-2 number, since 2×206568236005² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206568236003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20656823596 + ... + 20656823605.

It is an arithmetic number, because the mean of its divisors is an integer number (61970470803).

Almost surely, 2^206568236005 is an apocalyptic number.

It is an amenable number.

206568236005 is a deficient number, since it is larger than the sum of its proper divisors (41313647207).

206568236005 is an equidigital number, since it uses as much as digits as its factorization.

206568236005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41313647206.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 206568236005 in words is "two hundred six billion, five hundred sixty-eight million, two hundred thirty-six thousand, five".