678323548815 has 32 divisors (see below), whose sum is σ = 1184020298496. Its totient is φ = 328873762560.

The previous prime is 678323548787. The next prime is 678323548817. The reversal of 678323548815 is 518845323876.

It is a Cunningham number, because it is equal to 823604²-1.

It is not a de Polignac number, because 678323548815 - 2⁵ = 678323548783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678323548817) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9022219 + ... + 9097091.

It is an arithmetic number, because the mean of its divisors is an integer number (37000634328).

Almost surely, 2^678323548815 is an apocalyptic number.

678323548815 is a deficient number, since it is larger than the sum of its proper divisors (505696749681).

678323548815 is a wasteful number, since it uses less digits than its factorization.

678323548815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129799.

The product of its digits is 38707200, while the sum is 60.

The spelling of 678323548815 in words is "six hundred seventy-eight billion, three hundred twenty-three million, five hundred forty-eight thousand, eight hundred fifteen".