678895556779 has 8 divisors (see below), whose sum is σ = 740659933440. Its totient is φ = 617138946600.

The previous prime is 678895556749. The next prime is 678895556789. The reversal of 678895556779 is 977655598876.

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

It is not a de Polignac number, because 678895556779 - 2⁵ = 678895556747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678895556749) 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 7 ways as a sum of consecutive naturals, for example, 1758087 + ... + 2109184.

It is an arithmetic number, because the mean of its divisors is an integer number (92582491680).

Almost surely, 2^678895556779 is an apocalyptic number.

678895556779 is a deficient number, since it is larger than the sum of its proper divisors (61764376661).

678895556779 is a wasteful number, since it uses less digits than its factorization.

678895556779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3883241.

The product of its digits is 8001504000, while the sum is 82.

The spelling of 678895556779 in words is "six hundred seventy-eight billion, eight hundred ninety-five million, five hundred fifty-six thousand, seven hundred seventy-nine".