206666000 has 40 divisors (see below), whose sum is σ = 499723224. Its totient is φ = 82665600.

The previous prime is 206665961. The next prime is 206666023. The reversal of 206666000 is 666602.

It can be written as a sum of positive squares in 4 ways, for example, as 226576 + 206439424 = 476^2 + 14368^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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 7 ways as a sum of consecutive naturals, for example, 49667 + ... + 53666.

Almost surely, 2^206666000 is an apocalyptic number.

206666000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206666000 is an abundant number, since it is smaller than the sum of its proper divisors (293057224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206666000 is a wasteful number, since it uses less digits than its factorization.

206666000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103356 (or 103340 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 206666000 is about 14375.8825816017. The cubic root of 206666000 is about 591.2298391336.

The spelling of 206666000 in words is "two hundred six million, six hundred sixty-six thousand".