68665505844 has 96 divisors (see below), whose sum is σ = 173479487104. Its totient is φ = 21013655040.

The previous prime is 68665505819. The next prime is 68665505873. The reversal of 68665505844 is 44850556686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24495747 + ... + 24498549.

Almost surely, 2^68665505844 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 68665505844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86739743552).

68665505844 is an abundant number, since it is smaller than the sum of its proper divisors (104813981260).

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

68665505844 is a wasteful number, since it uses less digits than its factorization.

68665505844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3617 (or 3615 counting only the distinct ones).

The product of its (nonzero) digits is 27648000, while the sum is 57.

The spelling of 68665505844 in words is "sixty-eight billion, six hundred sixty-five million, five hundred five thousand, eight hundred forty-four".