65543208535872 has 168 divisors, whose sum is σ = 194358931921440. Its totient is φ = 21092959319040.

The previous prime is 65543208535829. The next prime is 65543208535879. The reversal of 65543208535872 is 27853580234556.

65543208535872 is a `hidden beast` number, since 6 + 5 + 5 + 4 + 3 + 20 + 8 + 535 + 8 + 72 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65543208535879) 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, 266656743 + ... + 266902425.

Almost surely, 2^{65543208535872} 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 65543208535872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97179465960720).

65543208535872 is an abundant number, since it is smaller than the sum of its proper divisors (128815723385568).

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

65543208535872 is a wasteful number, since it uses less digits than its factorization.

65543208535872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261701 (or 261688 counting only the distinct ones).

The product of its (nonzero) digits is 241920000, while the sum is 63.

The spelling of 65543208535872 in words is "sixty-five trillion, five hundred forty-three billion, two hundred eight million, five hundred thirty-five thousand, eight hundred seventy-two".