686740020107 has 4 divisors (see below), whose sum is σ = 727136491896. Its totient is φ = 646343548320.

The previous prime is 686740020041. The next prime is 686740020119. The reversal of 686740020107 is 701020047686.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 686740020107 - 2⁸ = 686740019851 is a prime.

It is a super-2 number, since 2×686740020107² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686740026107) 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 3 ways as a sum of consecutive naturals, for example, 20198235869 + ... + 20198235902.

It is an arithmetic number, because the mean of its divisors is an integer number (181784122974).

Almost surely, 2^686740020107 is an apocalyptic number.

686740020107 is a deficient number, since it is larger than the sum of its proper divisors (40396471789).

686740020107 is a wasteful number, since it uses less digits than its factorization.

686740020107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40396471788.

The product of its (nonzero) digits is 112896, while the sum is 41.

The spelling of 686740020107 in words is "six hundred eighty-six billion, seven hundred forty million, twenty thousand, one hundred seven".