686255404552686 has 48 divisors (see below), whose sum is σ = 1538235623630160. Its totient is φ = 220852757946240.

The previous prime is 686255404552681. The next prime is 686255404552691.

686255404552686 is a `hidden beast` number, since 6 + 8 + 6 + 2 + 5 + 5 + 4 + 0 + 4 + 552 + 68 + 6 = 666.

686255404552686 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (686255404552681) and next prime (686255404552691).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686255404552681) 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 23 ways as a sum of consecutive naturals, for example, 22441800 + ... + 43314491.

It is an arithmetic number, because the mean of its divisors is an integer number (32046575492295).

Almost surely, 2^{686255404552686} is an apocalyptic number.

686255404552686 is an abundant number, since it is smaller than the sum of its proper divisors (851980219077474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686255404552686 is a wasteful number, since it uses less digits than its factorization.

686255404552686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65776321 (or 65776318 counting only the distinct ones).

The product of its (nonzero) digits is 3317760000, while the sum is 72.

The spelling of 686255404552686 in words is "six hundred eighty-six trillion, two hundred fifty-five billion, four hundred four million, five hundred fifty-two thousand, six hundred eighty-six".