678915539443 has 4 divisors (see below), whose sum is σ = 683239842400. Its totient is φ = 674591236488.

The previous prime is 678915539429. The next prime is 678915539453. The reversal of 678915539443 is 344935519876.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 678915539443 - 2¹⁷ = 678915408371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678915539453) 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 3 ways as a sum of consecutive naturals, for example, 2162151243 + ... + 2162151556.

It is an arithmetic number, because the mean of its divisors is an integer number (170809960600).

Almost surely, 2^678915539443 is an apocalyptic number.

678915539443 is a deficient number, since it is larger than the sum of its proper divisors (4324302957).

678915539443 is a wasteful number, since it uses less digits than its factorization.

678915539443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4324302956.

The product of its digits is 97977600, while the sum is 64.

The spelling of 678915539443 in words is "six hundred seventy-eight billion, nine hundred fifteen million, five hundred thirty-nine thousand, four hundred forty-three".