68321551536 has 120 divisors (see below), whose sum is σ = 218921773824. Its totient is φ = 19484599680.

The previous prime is 68321551531. The next prime is 68321551553. The reversal of 68321551536 is 63515512386.

68321551536 is a `hidden beast` number, since 6 + 83 + 21 + 5 + 515 + 36 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 68321551491 and 68321551500.

It is not an unprimeable number, because it can be changed into a prime (68321551531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 489421 + ... + 613331.

Almost surely, 2^68321551536 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 68321551536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109460886912).

68321551536 is an abundant number, since it is smaller than the sum of its proper divisors (150600222288).

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

68321551536 is a wasteful number, since it uses less digits than its factorization.

68321551536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124479 (or 124470 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The spelling of 68321551536 in words is "sixty-eight billion, three hundred twenty-one million, five hundred fifty-one thousand, five hundred thirty-six".