686061866 has 8 divisors (see below), whose sum is σ = 1176106080. Its totient is φ = 294026508.

The previous prime is 686061847. The next prime is 686061869. The reversal of 686061866 is 668160686.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 686061866.

It is not an unprimeable number, because it can be changed into a prime (686061869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24502196 + ... + 24502223.

It is an arithmetic number, because the mean of its divisors is an integer number (147013260).

Almost surely, 2^686061866 is an apocalyptic number.

686061866 is a deficient number, since it is larger than the sum of its proper divisors (490044214).

686061866 is a wasteful number, since it uses less digits than its factorization.

686061866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49004428.

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 686061866 is about 26192.7827082195. The cubic root of 686061866 is about 881.9712464681.

The spelling of 686061866 in words is "six hundred eighty-six million, sixty-one thousand, eight hundred sixty-six".