684378510593 has 2 divisors, whose sum is σ = 684378510594. Its totient is φ = 684378510592.

The previous prime is 684378510589. The next prime is 684378510601. The reversal of 684378510593 is 395015873486.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 658813058929 + 25565451664 = 811673^2 + 159892^2 .

It is a cyclic number.

It is not a de Polignac number, because 684378510593 - 2² = 684378510589 is a prime.

It is a super-2 number, since 2×684378510593² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (684378510553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342189255296 + 342189255297.

It is an arithmetic number, because the mean of its divisors is an integer number (342189255297).

Almost surely, 2^684378510593 is an apocalyptic number.

It is an amenable number.

684378510593 is a deficient number, since it is larger than the sum of its proper divisors (1).

684378510593 is an equidigital number, since it uses as much as digits as its factorization.

684378510593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21772800, while the sum is 59.

The spelling of 684378510593 in words is "six hundred eighty-four billion, three hundred seventy-eight million, five hundred ten thousand, five hundred ninety-three".