678488279617 has 8 divisors (see below), whose sum is σ = 702354588840. Its totient is φ = 654653314560.

The previous prime is 678488279593. The next prime is 678488279657. The reversal of 678488279617 is 716972884876.

It is a Cunningham number, because it is equal to 823704²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 355783618576 + 322704661041 = 596476^2 + 568071^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678488279617 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 678488279617.

It is not an unprimeable number, because it can be changed into a prime (678488279657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7791984 + ... + 7878577.

It is an arithmetic number, because the mean of its divisors is an integer number (87794323605).

Almost surely, 2^678488279617 is an apocalyptic number.

It is an amenable number.

678488279617 is a deficient number, since it is larger than the sum of its proper divisors (23866309223).

678488279617 is a wasteful number, since it uses less digits than its factorization.

678488279617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15672083.

The product of its digits is 455196672, while the sum is 73.

The spelling of 678488279617 in words is "six hundred seventy-eight billion, four hundred eighty-eight million, two hundred seventy-nine thousand, six hundred seventeen".