66075330257838 has 160 divisors (see below), whose sum is σ = 171508553647200. Its totient is φ = 18791013795840.

The previous prime is 66075330257837. The next prime is 66075330257857. The reversal of 66075330257838 is 83875203357066.

It is a happy number.

66075330257838 is a `hidden beast` number, since 6 + 6 + 0 + 7 + 53 + 3 + 0 + 2 + 578 + 3 + 8 = 666.

66075330257838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66075330257837) by changing a digit.

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 79 ways as a sum of consecutive naturals, for example, 7447770 + ... + 13697442.

It is an arithmetic number, because the mean of its divisors is an integer number (1071928460295).

Almost surely, 2^{66075330257838} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66075330257838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85754276823600).

66075330257838 is an abundant number, since it is smaller than the sum of its proper divisors (105433223389362).

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

66075330257838 is a wasteful number, since it uses less digits than its factorization.

66075330257838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6250064 (or 6250055 counting only the distinct ones).

The product of its (nonzero) digits is 152409600, while the sum is 63.

The spelling of 66075330257838 in words is "sixty-six trillion, seventy-five billion, three hundred thirty million, two hundred fifty-seven thousand, eight hundred thirty-eight".