68401643616 has 120 divisors (see below), whose sum is σ = 201385694664. Its totient is φ = 22775800320.

The previous prime is 68401643549. The next prime is 68401643617. The reversal of 68401643616 is 61634610486.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68401643617) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2456331 + ... + 2484021.

Almost surely, 2^68401643616 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 68401643616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100692847332).

68401643616 is an abundant number, since it is smaller than the sum of its proper divisors (132984051048).

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

68401643616 is a wasteful number, since it uses less digits than its factorization.

68401643616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28666 (or 28649 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 68401643616 in words is "sixty-eight billion, four hundred one million, six hundred forty-three thousand, six hundred sixteen".