206997666 has 32 divisors (see below), whose sum is σ = 437711040. Its totient is φ = 65078784.

The previous prime is 206997641. The next prime is 206997667. The reversal of 206997666 is 666799602.

It is not an unprimeable number, because it can be changed into a prime (206997667) 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 in 15 ways as a sum of consecutive naturals, for example, 22666 + ... + 30458.

It is an arithmetic number, because the mean of its divisors is an integer number (13678470).

Almost surely, 2^206997666 is an apocalyptic number.

206997666 is an abundant number, since it is smaller than the sum of its proper divisors (230713374).

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

206997666 is a wasteful number, since it uses less digits than its factorization.

206997666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8050.

The product of its (nonzero) digits is 1469664, while the sum is 51.

The square root of 206997666 is about 14387.4134576024. The cubic root of 206997666 is about 591.5459466551.

The spelling of 206997666 in words is "two hundred six million, nine hundred ninety-seven thousand, six hundred sixty-six".