66320521480400 has 120 divisors (see below), whose sum is σ = 174121312260864. Its totient is φ = 24074755891200.

The previous prime is 66320521480397. The next prime is 66320521480511. The reversal of 66320521480400 is 408412502366.

66320521480400 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 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 23 ways as a sum of consecutive naturals, for example, 10522592 + ... + 15600191.

Almost surely, 2^{66320521480400} is an apocalyptic number.

It is an amenable number.

66320521480400 is an abundant number, since it is smaller than the sum of its proper divisors (107800790780464).

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

66320521480400 is a wasteful number, since it uses less digits than its factorization.

66320521480400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26123389 (or 26123378 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 41.

Adding to 66320521480400 its reverse (408412502366), we get a palindrome (66728933982766).

The spelling of 66320521480400 in words is "sixty-six trillion, three hundred twenty billion, five hundred twenty-one million, four hundred eighty thousand, four hundred".