686668017 has 24 divisors (see below), whose sum is σ = 1067056416. Its totient is φ = 391637568.

The previous prime is 686668001. The next prime is 686668039. The reversal of 686668017 is 710866686.

It is not a de Polignac number, because 686668017 - 2⁴ = 686668001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (686668517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78613 + ... + 86909.

It is an arithmetic number, because the mean of its divisors is an integer number (44460684).

Almost surely, 2^686668017 is an apocalyptic number.

It is an amenable number.

686668017 is a deficient number, since it is larger than the sum of its proper divisors (380388399).

686668017 is a wasteful number, since it uses less digits than its factorization.

686668017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8877 (or 8870 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The square root of 686668017 is about 26204.3511081652. The cubic root of 686668017 is about 882.2309171143.

The spelling of 686668017 in words is "six hundred eighty-six million, six hundred sixty-eight thousand, seventeen".