68215678056 has 24 divisors (see below), whose sum is σ = 184750794930. Its totient is φ = 22738559328.

The previous prime is 68215677991. The next prime is 68215678067. The reversal of 68215678056 is 65087651286.

68215678056 is a `hidden beast` number, since 6 + 8 + 21 + 567 + 8 + 0 + 56 = 666.

It can be written as a sum of positive squares in only one way, i.e., 63609884100 + 4605793956 = 252210^2 + 67866^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 68215677993 and 68215678011.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 473719915 + ... + 473720058.

Almost surely, 2^68215678056 is an apocalyptic number.

It is an amenable number.

68215678056 is an abundant number, since it is smaller than the sum of its proper divisors (116535116874).

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

68215678056 is a wasteful number, since it uses less digits than its factorization.

68215678056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947439985 (or 947439978 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 54.

The spelling of 68215678056 in words is "sixty-eight billion, two hundred fifteen million, six hundred seventy-eight thousand, fifty-six".