66328364555544 has 256 divisors, whose sum is σ = 208992849408000. Its totient is φ = 17077693501440.

The previous prime is 66328364555513. The next prime is 66328364555591. The reversal of 66328364555544 is 44555546382366.

66328364555544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66328364555544² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13195974 + ... + 17515434.

It is an arithmetic number, because the mean of its divisors is an integer number (816378318000).

Almost surely, 2^{66328364555544} 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 66328364555544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104496424704000).

66328364555544 is an abundant number, since it is smaller than the sum of its proper divisors (142664484852456).

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

66328364555544 is a wasteful number, since it uses less digits than its factorization.

66328364555544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4319658 (or 4319654 counting only the distinct ones).

The product of its digits is 1244160000, while the sum is 66.

The spelling of 66328364555544 in words is "sixty-six trillion, three hundred twenty-eight billion, three hundred sixty-four million, five hundred fifty-five thousand, five hundred forty-four".