684664102405 has 8 divisors (see below), whose sum is σ = 869926153752. Its totient is φ = 515511794688.

The previous prime is 684664102379. The next prime is 684664102417. The reversal of 684664102405 is 504201466486.

It can be written as a sum of positive squares in 4 ways, for example, as 5027093604 + 679637008801 = 70902^2 + 824401^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 684664102405 - 2¹⁹ = 684663578117 is a prime.

It is a Duffinian number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 4027435812 + ... + 4027435981.

It is an arithmetic number, because the mean of its divisors is an integer number (108740769219).

Almost surely, 2^684664102405 is an apocalyptic number.

It is an amenable number.

684664102405 is a deficient number, since it is larger than the sum of its proper divisors (185262051347).

684664102405 is a wasteful number, since it uses less digits than its factorization.

684664102405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8054871815.

The product of its (nonzero) digits is 1105920, while the sum is 46.

The spelling of 684664102405 in words is "six hundred eighty-four billion, six hundred sixty-four million, one hundred two thousand, four hundred five".