678395117839 has 6 divisors (see below), whose sum is σ = 720648101264. Its totient is φ = 638489522400.

The previous prime is 678395117833. The next prime is 678395117843. The reversal of 678395117839 is 938711593876.

It is a happy number.

It is not a de Polignac number, because 678395117839 - 2³ = 678395117831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678395117831) 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 in 5 ways as a sum of consecutive naturals, for example, 1173693687 + ... + 1173694264.

Almost surely, 2^678395117839 is an apocalyptic number.

678395117839 is a deficient number, since it is larger than the sum of its proper divisors (42252983425).

678395117839 is a wasteful number, since it uses less digits than its factorization.

678395117839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2347387985 (or 2347387968 counting only the distinct ones).

The product of its digits is 68584320, while the sum is 67.

The spelling of 678395117839 in words is "six hundred seventy-eight billion, three hundred ninety-five million, one hundred seventeen thousand, eight hundred thirty-nine".