686799997686 has 48 divisors (see below), whose sum is σ = 1623440931840. Its totient is φ = 208108970160.

The previous prime is 686799997673. The next prime is 686799997691.

It is a happy number.

686799997686 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 686799997596 and 686799997605.

It is a congruent number.

It is an unprimeable number.

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, 3613711 + ... + 3799013.

It is an arithmetic number, because the mean of its divisors is an integer number (33821686080).

Almost surely, 2^686799997686 is an apocalyptic number.

686799997686 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

686799997686 is an abundant number, since it is smaller than the sum of its proper divisors (936640934154).

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

686799997686 is a wasteful number, since it uses less digits than its factorization.

686799997686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204041 (or 204038 counting only the distinct ones).

The product of its digits is 26665583616, while the sum is 90.

The spelling of 686799997686 in words is "six hundred eighty-six billion, seven hundred ninety-nine million, nine hundred ninety-seven thousand, six hundred eighty-six".