206666907 has 8 divisors (see below), whose sum is σ = 278284560. Its totient is φ = 136413600.

The previous prime is 206666893. The next prime is 206666917. The reversal of 206666907 is 709666602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 206666907 - 2⁶ = 206666843 is a prime.

It is a super-2 number, since 2×206666907² = 85422420897893298, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (206666917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340732 + ... + 341337.

It is an arithmetic number, because the mean of its divisors is an integer number (34785570).

Almost surely, 2^206666907 is an apocalyptic number.

206666907 is a deficient number, since it is larger than the sum of its proper divisors (71617653).

206666907 is a wasteful number, since it uses less digits than its factorization.

206666907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682173.

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 206666907 is about 14375.9141274564. The cubic root of 206666907 is about 591.2307040472.

The spelling of 206666907 in words is "two hundred six million, six hundred sixty-six thousand, nine hundred seven".