686668115 has 24 divisors (see below), whose sum is σ = 960212880. Its totient is φ = 470033088.

The previous prime is 686668091. The next prime is 686668127. The reversal of 686668115 is 511866686.

It is not a de Polignac number, because 686668115 - 2¹⁴ = 686651731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686668115.

It is an unprimeable number.

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, 159329 + ... + 163581.

It is an arithmetic number, because the mean of its divisors is an integer number (40008870).

Almost surely, 2^686668115 is an apocalyptic number.

686668115 is a deficient number, since it is larger than the sum of its proper divisors (273544765).

686668115 is a wasteful number, since it uses less digits than its factorization.

686668115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4931 (or 4924 counting only the distinct ones).

The product of its digits is 414720, while the sum is 47.

The square root of 686668115 is about 26204.3529780836. The cubic root of 686668115 is about 882.2309590845.

The spelling of 686668115 in words is "six hundred eighty-six million, six hundred sixty-eight thousand, one hundred fifteen".