66530216517220 has 96 divisors (see below), whose sum is σ = 141710995843200. Its totient is φ = 26234084567040.

The previous prime is 66530216517203. The next prime is 66530216517223. The reversal of 66530216517220 is 2271561203566.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66530216517223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4943904732 + ... + 4943918188.

It is an arithmetic number, because the mean of its divisors is an integer number (1476156206700).

Almost surely, 2^{66530216517220} is an apocalyptic number.

It is an amenable number.

66530216517220 is an abundant number, since it is smaller than the sum of its proper divisors (75180779325980).

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

66530216517220 is a wasteful number, since it uses less digits than its factorization.

66530216517220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24733 (or 24731 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 66530216517220 in words is "sixty-six trillion, five hundred thirty billion, two hundred sixteen million, five hundred seventeen thousand, two hundred twenty".