206716857 has 16 divisors (see below), whose sum is σ = 281959680. Its totient is φ = 134652672.

The previous prime is 206716849. The next prime is 206716871. The reversal of 206716857 is 758617602.

It is not a de Polignac number, because 206716857 - 2³ = 206716849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206716837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141543 + ... + 142995.

It is an arithmetic number, because the mean of its divisors is an integer number (17622480).

Almost surely, 2^206716857 is an apocalyptic number.

It is an amenable number.

206716857 is a deficient number, since it is larger than the sum of its proper divisors (75242823).

206716857 is a wasteful number, since it uses less digits than its factorization.

206716857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512.

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 206716857 is about 14377.6513033249. The cubic root of 206716857 is about 591.2783323705.

The spelling of 206716857 in words is "two hundred six million, seven hundred sixteen thousand, eight hundred fifty-seven".