684861108655 has 8 divisors (see below), whose sum is σ = 821895730992. Its totient is φ = 547847286528.

The previous prime is 684861108623. The next prime is 684861108677. The reversal of 684861108655 is 556801168486.

It is a happy number.

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 684861108655 - 2⁵ = 684861108623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 684861108655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5127522 + ... + 5259391.

It is an arithmetic number, because the mean of its divisors is an integer number (102736966374).

Almost surely, 2^684861108655 is an apocalyptic number.

684861108655 is a deficient number, since it is larger than the sum of its proper divisors (137034622337).

684861108655 is a wasteful number, since it uses less digits than its factorization.

684861108655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10400105.

The product of its (nonzero) digits is 11059200, while the sum is 58.

The spelling of 684861108655 in words is "six hundred eighty-four billion, eight hundred sixty-one million, one hundred eight thousand, six hundred fifty-five".