684842312677 has 2 divisors, whose sum is σ = 684842312678. Its totient is φ = 684842312676.

The previous prime is 684842312663. The next prime is 684842312711. The reversal of 684842312677 is 776213248486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 433930482756 + 250911829921 = 658734^2 + 500911^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684842312677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684842312647) 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, 342421156338 + 342421156339.

It is an arithmetic number, because the mean of its divisors is an integer number (342421156339).

Almost surely, 2^684842312677 is an apocalyptic number.

It is an amenable number.

684842312677 is a deficient number, since it is larger than the sum of its proper divisors (1).

684842312677 is an equidigital number, since it uses as much as digits as its factorization.

684842312677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21676032, while the sum is 58.

The spelling of 684842312677 in words is "six hundred eighty-four billion, eight hundred forty-two million, three hundred twelve thousand, six hundred seventy-seven".