678657544656 has 320 divisors, whose sum is σ = 2173935859200. Its totient is φ = 177652113408.

The previous prime is 678657544651. The next prime is 678657544661. The reversal of 678657544656 is 656445756876.

It is an interprime number because it is at equal distance from previous prime (678657544651) and next prime (678657544661).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678657544651) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 397107130 + ... + 397108838.

It is an arithmetic number, because the mean of its divisors is an integer number (6793549560).

Almost surely, 2^678657544656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678657544656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1086967929600).

678657544656 is an abundant number, since it is smaller than the sum of its proper divisors (1495278314544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

678657544656 is a wasteful number, since it uses less digits than its factorization.

678657544656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2366 (or 2360 counting only the distinct ones).

The product of its digits is 1016064000, while the sum is 69.

The spelling of 678657544656 in words is "six hundred seventy-eight billion, six hundred fifty-seven million, five hundred forty-four thousand, six hundred fifty-six".