686586685699 has 2 divisors, whose sum is σ = 686586685700. Its totient is φ = 686586685698.

The previous prime is 686586685607. The next prime is 686586685711. The reversal of 686586685699 is 996586685686.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686586685699 is a prime.

It is a super-2 number, since 2×686586685699² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (686586685999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343293342849 + 343293342850.

It is an arithmetic number, because the mean of its divisors is an integer number (343293342850).

Almost surely, 2^686586685699 is an apocalyptic number.

686586685699 is a deficient number, since it is larger than the sum of its proper divisors (1).

686586685699 is an equidigital number, since it uses as much as digits as its factorization.

686586685699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8062156800, while the sum is 82.

The spelling of 686586685699 in words is "six hundred eighty-six billion, five hundred eighty-six million, six hundred eighty-five thousand, six hundred ninety-nine".