685173433678 has 8 divisors (see below), whose sum is σ = 1028166226920. Its totient is φ = 342451358040.

The previous prime is 685173433669. The next prime is 685173433687. The reversal of 685173433678 is 876334371586.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (685173433669) and next prime (685173433687).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67673073 + ... + 67683196.

It is an arithmetic number, because the mean of its divisors is an integer number (128520778365).

Almost surely, 2^685173433678 is an apocalyptic number.

685173433678 is a deficient number, since it is larger than the sum of its proper divisors (342992793242).

685173433678 is a wasteful number, since it uses less digits than its factorization.

685173433678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135358802.

The product of its digits is 60963840, while the sum is 61.

The spelling of 685173433678 in words is "six hundred eighty-five billion, one hundred seventy-three million, four hundred thirty-three thousand, six hundred seventy-eight".