686064774666 has 16 divisors (see below), whose sum is σ = 1373473469088. Its totient is φ = 228464271600.

The previous prime is 686064774649. The next prime is 686064774673. The reversal of 686064774666 is 666477460686.

It is a junction number, because it is equal to n+sod(n) for n = 686064774597 and 686064774606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55990020 + ... + 56002271.

It is an arithmetic number, because the mean of its divisors is an integer number (85842091818).

Almost surely, 2^686064774666 is an apocalyptic number.

686064774666 is an abundant number, since it is smaller than the sum of its proper divisors (687408694422).

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

686064774666 is a wasteful number, since it uses less digits than its factorization.

686064774666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111993317.

The product of its (nonzero) digits is 292626432, while the sum is 66.

The spelling of 686064774666 in words is "six hundred eighty-six billion, sixty-four million, seven hundred seventy-four thousand, six hundred sixty-six".