686767165566 has 8 divisors (see below), whose sum is σ = 1373534331144. Its totient is φ = 228922388520.

The previous prime is 686767165559. The next prime is 686767165621. The reversal of 686767165566 is 665561767686.

It is a sphenic number, since it is the product of 3 distinct primes.

686767165566 is an admirable number.

It is a super-2 number, since 2×686767165566² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 686767165566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57230597125 + ... + 57230597136.

It is an arithmetic number, because the mean of its divisors is an integer number (171691791393).

Almost surely, 2^686767165566 is an apocalyptic number.

686767165566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

686767165566 is a wasteful number, since it uses less digits than its factorization.

686767165566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114461194266.

The product of its digits is 457228800, while the sum is 69.

The spelling of 686767165566 in words is "six hundred eighty-six billion, seven hundred sixty-seven million, one hundred sixty-five thousand, five hundred sixty-six".