684685081017 has 96 divisors (see below), whose sum is σ = 1209934582272. Its totient is φ = 364194496512.

The previous prime is 684685081009. The next prime is 684685081019. The reversal of 684685081017 is 710180586486.

It is a happy number.

684685081017 is a `hidden beast` number, since 68 + 4 + 68 + 508 + 1 + 0 + 17 = 666.

It is not a de Polignac number, because 684685081017 - 2³ = 684685081009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (684685081019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 58932393 + ... + 58944009.

It is an arithmetic number, because the mean of its divisors is an integer number (12603485232).

Almost surely, 2^684685081017 is an apocalyptic number.

It is an amenable number.

684685081017 is a deficient number, since it is larger than the sum of its proper divisors (525249501255).

684685081017 is a wasteful number, since it uses less digits than its factorization.

684685081017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12247 (or 12244 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 54.

The spelling of 684685081017 in words is "six hundred eighty-four billion, six hundred eighty-five million, eighty-one thousand, seventeen".