68543553408 has 384 divisors, whose sum is σ = 215666841600. Its totient is φ = 19217510400.

The previous prime is 68543553401. The next prime is 68543553487. The reversal of 68543553408 is 80435534586.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68543553401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33127798 + ... + 33129866.

It is an arithmetic number, because the mean of its divisors is an integer number (561632400).

Almost surely, 2^68543553408 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 68543553408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107833420800).

68543553408 is an abundant number, since it is smaller than the sum of its proper divisors (147123288192).

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

68543553408 is a wasteful number, since it uses less digits than its factorization.

68543553408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2162 (or 2139 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 51.

The spelling of 68543553408 in words is "sixty-eight billion, five hundred forty-three million, five hundred fifty-three thousand, four hundred eight".