66564612220 has 24 divisors (see below), whose sum is σ = 139804744464. Its totient is φ = 26622214656.

The previous prime is 66564612181. The next prime is 66564612229. The reversal of 66564612220 is 2221646566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66564612229) 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 7 ways as a sum of consecutive naturals, for example, 74022 + ... + 372301.

It is an arithmetic number, because the mean of its divisors is an integer number (5825197686).

Almost surely, 2^66564612220 is an apocalyptic number.

It is an amenable number.

66564612220 is an abundant number, since it is smaller than the sum of its proper divisors (73240132244).

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

66564612220 is a wasteful number, since it uses less digits than its factorization.

66564612220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453789 (or 453787 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 66564612220 in words is "sixty-six billion, five hundred sixty-four million, six hundred twelve thousand, two hundred twenty".