66424404220 has 48 divisors (see below), whose sum is σ = 142925531616. Its totient is φ = 25915904000.

The previous prime is 66424404083. The next prime is 66424404223. The reversal of 66424404220 is 2240442466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66424404223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6424455 + ... + 6434785.

It is an arithmetic number, because the mean of its divisors is an integer number (2977615242).

Almost surely, 2^66424404220 is an apocalyptic number.

It is an amenable number.

66424404220 is an abundant number, since it is smaller than the sum of its proper divisors (76501127396).

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

66424404220 is a wasteful number, since it uses less digits than its factorization.

66424404220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18222 (or 18220 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 34.

Adding to 66424404220 its reverse (2240442466), we get a palindrome (68664846686).

The spelling of 66424404220 in words is "sixty-six billion, four hundred twenty-four million, four hundred four thousand, two hundred twenty".