206710066 has 4 divisors (see below), whose sum is σ = 310065102. Its totient is φ = 103355032.

The previous prime is 206710061. The next prime is 206710067. The reversal of 206710066 is 660017602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 660017602 = 2 ⋅330008801.

It can be written as a sum of positive squares in only one way, i.e., 202236841 + 4473225 = 14221^2 + 2115^2 .

It is not an unprimeable number, because it can be changed into a prime (206710061) 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 as a sum of consecutive naturals, namely, 51677515 + ... + 51677518.

Almost surely, 2^206710066 is an apocalyptic number.

206710066 is a deficient number, since it is larger than the sum of its proper divisors (103355036).

206710066 is a wasteful number, since it uses less digits than its factorization.

206710066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103355035.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 206710066 is about 14377.4151362475. The cubic root of 206710066 is about 591.2718574669.

Adding to 206710066 its reverse (660017602), we get a palindrome (866727668).

The spelling of 206710066 in words is "two hundred six million, seven hundred ten thousand, sixty-six".