66504812928 has 128 divisors (see below), whose sum is σ = 190487203200. Its totient is φ = 20489195520.

The previous prime is 66504812917. The next prime is 66504812929. The reversal of 66504812928 is 82921840566.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66504812929) 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 15 ways as a sum of consecutive naturals, for example, 187975 + ... + 410297.

It is an arithmetic number, because the mean of its divisors is an integer number (1488181275).

Almost surely, 2^66504812928 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 66504812928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95243601600).

66504812928 is an abundant number, since it is smaller than the sum of its proper divisors (123982390272).

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

66504812928 is a wasteful number, since it uses less digits than its factorization.

66504812928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222400 (or 222388 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 51.

The spelling of 66504812928 in words is "sixty-six billion, five hundred four million, eight hundred twelve thousand, nine hundred twenty-eight".