686684601 has 16 divisors (see below), whose sum is σ = 1017777600. Its totient is φ = 457579584.

The previous prime is 686684599. The next prime is 686684629. The reversal of 686684601 is 106486686.

It is not a de Polignac number, because 686684601 - 2¹ = 686684599 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (686684641) 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 15 ways as a sum of consecutive naturals, for example, 73830 + ... + 82608.

It is an arithmetic number, because the mean of its divisors is an integer number (63611100).

Almost surely, 2^686684601 is an apocalyptic number.

It is an amenable number.

686684601 is a deficient number, since it is larger than the sum of its proper divisors (331092999).

686684601 is a wasteful number, since it uses less digits than its factorization.

686684601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11685 (or 11679 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 686684601 is about 26204.6675422528. The cubic root of 686684601 is about 882.2380194304.

The spelling of 686684601 in words is "six hundred eighty-six million, six hundred eighty-four thousand, six hundred one".