68910521136 has 80 divisors (see below), whose sum is σ = 181448502624. Its totient is φ = 22527977472.

The previous prime is 68910521111. The next prime is 68910521153. The reversal of 68910521136 is 63112501986.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11081100 + ... + 11087316.

Almost surely, 2^68910521136 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 68910521136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90724251312).

68910521136 is an abundant number, since it is smaller than the sum of its proper divisors (112537981488).

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

68910521136 is a wasteful number, since it uses less digits than its factorization.

68910521136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10638 (or 10632 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The spelling of 68910521136 in words is "sixty-eight billion, nine hundred ten million, five hundred twenty-one thousand, one hundred thirty-six".