684861108677 has 2 divisors, whose sum is σ = 684861108678. Its totient is φ = 684861108676.

The previous prime is 684861108623. The next prime is 684861108733. The reversal of 684861108677 is 776801168486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 545402928196 + 139458180481 = 738514^2 + 373441^2 .

It is a cyclic number.

It is not a de Polignac number, because 684861108677 - 2¹² = 684861104581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684861108277) 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 as a sum of consecutive naturals, namely, 342430554338 + 342430554339.

It is an arithmetic number, because the mean of its divisors is an integer number (342430554339).

Almost surely, 2^684861108677 is an apocalyptic number.

It is an amenable number.

684861108677 is a deficient number, since it is larger than the sum of its proper divisors (1).

684861108677 is an equidigital number, since it uses as much as digits as its factorization.

684861108677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21676032, while the sum is 62.

The spelling of 684861108677 in words is "six hundred eighty-four billion, eight hundred sixty-one million, one hundred eight thousand, six hundred seventy-seven".