678720861351378 has 12 divisors (see below), whose sum is σ = 1470561866261358. Its totient is φ = 226240287117120.

The previous prime is 678720861351361. The next prime is 678720861351451. The reversal of 678720861351378 is 873153168027876.

678720861351378 is a `hidden beast` number, since 6 + 7 + 8 + 7 + 20 + 8 + 6 + 13 + 513 + 78 = 666.

It can be written as a sum of positive squares in only one way, i.e., 522285981694929 + 156434879656449 = 22853577^2 + 12507393^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18853357259743 + ... + 18853357259778.

Almost surely, 2^{678720861351378} is an apocalyptic number.

678720861351378 is an abundant number, since it is smaller than the sum of its proper divisors (791841004909980).

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

678720861351378 is a wasteful number, since it uses less digits than its factorization.

678720861351378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37706714519529 (or 37706714519526 counting only the distinct ones).

The product of its (nonzero) digits is 568995840, while the sum is 72.

The spelling of 678720861351378 in words is "six hundred seventy-eight trillion, seven hundred twenty billion, eight hundred sixty-one million, three hundred fifty-one thousand, three hundred seventy-eight".