206612005 has 4 divisors (see below), whose sum is σ = 247934412. Its totient is φ = 165289600.

The previous prime is 206611991. The next prime is 206612017. The reversal of 206612005 is 500216602.

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 33663204 + 172948801 = 5802^2 + 13151^2 .

It is not a de Polignac number, because 206612005 - 2⁷ = 206611877 is a prime.

It is a super-2 number, since 2×206612005² = 85377041220240050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 20661196 + ... + 20661205.

It is an arithmetic number, because the mean of its divisors is an integer number (61983603).

Almost surely, 2^206612005 is an apocalyptic number.

It is an amenable number.

206612005 is a deficient number, since it is larger than the sum of its proper divisors (41322407).

206612005 is an equidigital number, since it uses as much as digits as its factorization.

206612005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41322406.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 206612005 is about 14374.0044872680. The cubic root of 206612005 is about 591.1783450389.

Adding to 206612005 its reverse (500216602), we get a palindrome (706828607).

The spelling of 206612005 in words is "two hundred six million, six hundred twelve thousand, five".