686216756009665 has 16 divisors (see below), whose sum is σ = 861656210092800. Its totient is φ = 523642307860672.

The previous prime is 686216756009567. The next prime is 686216756009669. The reversal of 686216756009665 is 566900657612686.

It is a cyclic number.

It is not a de Polignac number, because 686216756009665 - 2⁹ = 686216756009153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (686216756009669) 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 in 15 ways as a sum of consecutive naturals, for example, 8310686050 + ... + 8310768619.

It is an arithmetic number, because the mean of its divisors is an integer number (53853513130800).

Almost surely, 2^{686216756009665} is an apocalyptic number.

It is an amenable number.

686216756009665 is a deficient number, since it is larger than the sum of its proper divisors (175439454083135).

686216756009665 is a wasteful number, since it uses less digits than its factorization.

686216756009665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16621455056.

The product of its (nonzero) digits is 1175731200, while the sum is 73.

The spelling of 686216756009665 in words is "six hundred eighty-six trillion, two hundred sixteen billion, seven hundred fifty-six million, nine thousand, six hundred sixty-five".