678105659268 has 18 divisors (see below), whose sum is σ = 1714100416574. Its totient is φ = 226035219744.

The previous prime is 678105659221. The next prime is 678105659293. The reversal of 678105659268 is 862956501876.

678105659268 is a `hidden beast` number, since 6 + 7 + 8 + 1 + 0 + 565 + 9 + 2 + 68 = 666.

It can be written as a sum of positive squares in only one way, i.e., 678083077764 + 22581504 = 823458^2 + 4752^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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, 9418134121 + ... + 9418134192.

Almost surely, 2^678105659268 is an apocalyptic number.

It is an amenable number.

678105659268 is an abundant number, since it is smaller than the sum of its proper divisors (1035994757306).

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

678105659268 is a wasteful number, since it uses less digits than its factorization.

678105659268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18836268323 (or 18836268318 counting only the distinct ones).

The product of its (nonzero) digits is 43545600, while the sum is 63.

The spelling of 678105659268 in words is "six hundred seventy-eight billion, one hundred five million, six hundred fifty-nine thousand, two hundred sixty-eight".