686656168 has 32 divisors (see below), whose sum is σ = 1465594560. Its totient is φ = 298545280.

The previous prime is 686656109. The next prime is 686656183. The reversal of 686656168 is 861656686.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167605 + ... + 171652.

It is an arithmetic number, because the mean of its divisors is an integer number (45799830).

Almost surely, 2^686656168 is an apocalyptic number.

It is an amenable number.

686656168 is an abundant number, since it is smaller than the sum of its proper divisors (778938392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686656168 is a wasteful number, since it uses less digits than its factorization.

686656168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339297 (or 339293 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 52.

The square root of 686656168 is about 26204.1250187828. The cubic root of 686656168 is about 882.2258425543.

The spelling of 686656168 in words is "six hundred eighty-six million, six hundred fifty-six thousand, one hundred sixty-eight".