686710680281 has 2 divisors, whose sum is σ = 686710680282. Its totient is φ = 686710680280.

The previous prime is 686710680263. The next prime is 686710680289. The reversal of 686710680281 is 182086017686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 615879648400 + 70831031881 = 784780^2 + 266141^2 .

It is a cyclic number.

It is not a de Polignac number, because 686710680281 - 2¹⁸ = 686710418137 is a prime.

It is a super-2 number, since 2×686710680281² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (686710680289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343355340140 + 343355340141.

It is an arithmetic number, because the mean of its divisors is an integer number (343355340141).

Almost surely, 2^686710680281 is an apocalyptic number.

It is an amenable number.

686710680281 is a deficient number, since it is larger than the sum of its proper divisors (1).

686710680281 is an equidigital number, since it uses as much as digits as its factorization.

686710680281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1548288, while the sum is 53.

The spelling of 686710680281 in words is "six hundred eighty-six billion, seven hundred ten million, six hundred eighty thousand, two hundred eighty-one".