66421545574120 has 64 divisors (see below), whose sum is σ = 163862290310400. Its totient is φ = 24030683738880.

The previous prime is 66421545574081. The next prime is 66421545574127. The reversal of 66421545574120 is 2147554512466.

66421545574120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (66421545574127) 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, 383055600 + ... + 383228959.

It is an arithmetic number, because the mean of its divisors is an integer number (2560348286100).

Almost surely, 2^{66421545574120} is an apocalyptic number.

It is an amenable number.

66421545574120 is an abundant number, since it is smaller than the sum of its proper divisors (97440744736280).

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

66421545574120 is a wasteful number, since it uses less digits than its factorization.

66421545574120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766284778 (or 766284774 counting only the distinct ones).

The product of its (nonzero) digits is 8064000, while the sum is 52.

The spelling of 66421545574120 in words is "sixty-six trillion, four hundred twenty-one billion, five hundred forty-five million, five hundred seventy-four thousand, one hundred twenty".