206681657 has 24 divisors (see below), whose sum is σ = 270196416. Its totient is φ = 156407328.

The previous prime is 206681647. The next prime is 206681663. The reversal of 206681657 is 756186602.

206681657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 206681657 - 2¹⁰ = 206680633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206681647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7598 + ... + 21704.

It is an arithmetic number, because the mean of its divisors is an integer number (11258184).

Almost surely, 2^206681657 is an apocalyptic number.

It is an amenable number.

206681657 is a deficient number, since it is larger than the sum of its proper divisors (63514759).

206681657 is a wasteful number, since it uses less digits than its factorization.

206681657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14157 (or 14150 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 206681657 is about 14376.4271291583. The cubic root of 206681657 is about 591.2447692654.

The spelling of 206681657 in words is "two hundred six million, six hundred eighty-one thousand, six hundred fifty-seven".