66538421830530 has 576 divisors, whose sum is σ = 195175536716160. Its totient is φ = 15707511705600.

The previous prime is 66538421830499. The next prime is 66538421830589. The reversal of 66538421830530 is 3503812483566.

66538421830530 is a `hidden beast` number, since 6 + 6 + 5 + 3 + 8 + 4 + 21 + 83 + 0 + 530 = 666.

66538421830530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 287 ways as a sum of consecutive naturals, for example, 23857446376 + ... + 23857449164.

It is an arithmetic number, because the mean of its divisors is an integer number (338846417910).

Almost surely, 2^{66538421830530} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66538421830530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97587768358080).

66538421830530 is an abundant number, since it is smaller than the sum of its proper divisors (128637114885630).

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

66538421830530 is a wasteful number, since it uses less digits than its factorization.

66538421830530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3507 (or 3491 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 54.

The spelling of 66538421830530 in words is "sixty-six trillion, five hundred thirty-eight billion, four hundred twenty-one million, eight hundred thirty thousand, five hundred thirty".