206331666 has 16 divisors (see below), whose sum is σ = 430605504. Its totient is φ = 65786864.

The previous prime is 206331661. The next prime is 206331667. The reversal of 206331666 is 666133602.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (206331661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 747441 + ... + 747716.

It is an arithmetic number, because the mean of its divisors is an integer number (26912844).

Almost surely, 2^206331666 is an apocalyptic number.

206331666 is an abundant number, since it is smaller than the sum of its proper divisors (224273838).

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

206331666 is a wasteful number, since it uses less digits than its factorization.

206331666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495185.

The product of its (nonzero) digits is 23328, while the sum is 33.

The square root of 206331666 is about 14364.2495801208. The cubic root of 206331666 is about 590.9108462892.

The spelling of 206331666 in words is "two hundred six million, three hundred thirty-one thousand, six hundred sixty-six".