686660051067 has 48 divisors (see below), whose sum is σ = 968171536416. Its totient is φ = 432812160000.

The previous prime is 686660051023. The next prime is 686660051101. The reversal of 686660051067 is 760150066686.

It is a happy number.

It is not a de Polignac number, because 686660051067 - 2¹⁹ = 686659526779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (686660056067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 105946467 + ... + 105952947.

It is an arithmetic number, because the mean of its divisors is an integer number (20170240342).

Almost surely, 2^686660051067 is an apocalyptic number.

686660051067 is a deficient number, since it is larger than the sum of its proper divisors (281511485349).

686660051067 is a wasteful number, since it uses less digits than its factorization.

686660051067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7292 (or 7269 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 686660051067 in words is "six hundred eighty-six billion, six hundred sixty million, fifty-one thousand, sixty-seven".