684178586912 has 18 divisors (see below), whose sum is σ = 1346985804969. Its totient is φ = 342086953920.

The previous prime is 684178586801. The next prime is 684178586941. The reversal of 684178586912 is 219685871486.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 662263929616 + 21914657296 = 813796^2 + 148036^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=584884.

It is a super-2 number, since 2×684178586912² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 4605962 + ... + 4752182.

Almost surely, 2^684178586912 is an apocalyptic number.

It is an amenable number.

684178586912 is a deficient number, since it is larger than the sum of its proper divisors (662807218057).

684178586912 is an frugal number, since it uses more digits than its factorization.

684178586912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292452 (or 146223 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 65.

The spelling of 684178586912 in words is "six hundred eighty-four billion, one hundred seventy-eight million, five hundred eighty-six thousand, nine hundred twelve".