678756777778 has 8 divisors (see below), whose sum is σ = 1018168944768. Its totient is φ = 339367129524.

The previous prime is 678756777757. The next prime is 678756777779. The reversal of 678756777778 is 877777657876.

678756777778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (678756777779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5554126 + ... + 5675017.

It is an arithmetic number, because the mean of its divisors is an integer number (127271118096).

Almost surely, 2^678756777778 is an apocalyptic number.

678756777778 is a deficient number, since it is larger than the sum of its proper divisors (339412166990).

678756777778 is a wasteful number, since it uses less digits than its factorization.

678756777778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11259368.

The product of its digits is 9487215360, while the sum is 82.

The spelling of 678756777778 in words is "six hundred seventy-eight billion, seven hundred fifty-six million, seven hundred seventy-seven thousand, seven hundred seventy-eight".