66580220 has 36 divisors (see below), whose sum is σ = 162648360. Its totient is φ = 22827168.

The previous prime is 66580207. The next prime is 66580223. The reversal of 66580220 is 2208566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66580223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32990 + ... + 34949.

It is an arithmetic number, because the mean of its divisors is an integer number (4518010).

Almost surely, 2^66580220 is an apocalyptic number.

It is an amenable number.

66580220 is an abundant number, since it is smaller than the sum of its proper divisors (96068140).

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

66580220 is a wasteful number, since it uses less digits than its factorization.

66580220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67962 (or 67953 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 66580220 is about 8159.6703364781. The cubic root of 66580220 is about 405.3047952000.

Adding to 66580220 its reverse (2208566), we get a palindrome (68788786).

The spelling of 66580220 in words is "sixty-six million, five hundred eighty thousand, two hundred twenty".