206706664 has 32 divisors (see below), whose sum is σ = 402712200. Its totient is φ = 99348480.

The previous prime is 206706607. The next prime is 206706737. The reversal of 206706664 is 466607602.

It can be written as a sum of positive squares in 4 ways, for example, as 161036100 + 45670564 = 12690^2 + 6758^2 .

It is an unprimeable number.

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, 54064 + ... + 57760.

Almost surely, 2^206706664 is an apocalyptic number.

It is an amenable number.

206706664 is a deficient number, since it is larger than the sum of its proper divisors (196005536).

206706664 is a wasteful number, since it uses less digits than its factorization.

206706664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3973 (or 3969 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 206706664 is about 14377.2968252033. The cubic root of 206706664 is about 591.2686137644.

The spelling of 206706664 in words is "two hundred six million, seven hundred six thousand, six hundred sixty-four".