686830374209 has 16 divisors (see below), whose sum is σ = 820787281920. Its totient is φ = 561939916560.

The previous prime is 686830374193. The next prime is 686830374211. The reversal of 686830374209 is 902473038686.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 686830374209 - 2⁴ = 686830374193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (686830374289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4375937 + ... + 4530174.

It is an arithmetic number, because the mean of its divisors is an integer number (51299205120).

Almost surely, 2^686830374209 is an apocalyptic number.

It is an amenable number.

686830374209 is a deficient number, since it is larger than the sum of its proper divisors (133956907711).

686830374209 is a wasteful number, since it uses less digits than its factorization.

686830374209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8906620.

The product of its (nonzero) digits is 10450944, while the sum is 56.

The spelling of 686830374209 in words is "six hundred eighty-six billion, eight hundred thirty million, three hundred seventy-four thousand, two hundred nine".