206666602 has 4 divisors (see below), whose sum is σ = 309999906. Its totient is φ = 103333300.

The previous prime is 206666549. The next prime is 206666611.

It is a happy number.

206666602 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in only one way, i.e., 189035001 + 17631601 = 13749^2 + 4199^2 .

It is a super-2 number, since 2×206666602² = 85422168764452808, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51666649 + ... + 51666652.

Almost surely, 2^206666602 is an apocalyptic number.

206666602 is a deficient number, since it is larger than the sum of its proper divisors (103333304).

206666602 is a wasteful number, since it uses less digits than its factorization.

206666602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103333303.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 206666602 is about 14375.9035194314. The cubic root of 206666602 is about 591.2304132000.

The spelling of 206666602 in words is "two hundred six million, six hundred sixty-six thousand, six hundred two".