206705667 has 12 divisors (see below), whose sum is σ = 320604936. Its totient is φ = 118117440.

The previous prime is 206705659. The next prime is 206705677. The reversal of 206705667 is 766507602.

It is not a de Polignac number, because 206705667 - 2³ = 206705659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206705647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 702934 + ... + 703227.

It is an arithmetic number, because the mean of its divisors is an integer number (26717078).

Almost surely, 2^206705667 is an apocalyptic number.

206705667 is a deficient number, since it is larger than the sum of its proper divisors (113899269).

206705667 is a wasteful number, since it uses less digits than its factorization.

206705667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406178 (or 1406171 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 39.

The square root of 206705667 is about 14377.2621524406. The cubic root of 206705667 is about 591.2676631488.

The spelling of 206705667 in words is "two hundred six million, seven hundred five thousand, six hundred sixty-seven".