66675220 has 12 divisors (see below), whose sum is σ = 140018004. Its totient is φ = 26670080.

The previous prime is 66675209. The next prime is 66675223. The reversal of 66675220 is 2257666.

It is a happy number.

66675220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 51667344 + 15007876 = 7188^2 + 3874^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66675223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1666861 + ... + 1666900.

It is an arithmetic number, because the mean of its divisors is an integer number (11668167).

Almost surely, 2^66675220 is an apocalyptic number.

It is an amenable number.

66675220 is an abundant number, since it is smaller than the sum of its proper divisors (73342784).

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

66675220 is a wasteful number, since it uses less digits than its factorization.

66675220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3333770 (or 3333768 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 66675220 is about 8165.4895750347. The cubic root of 66675220 is about 405.4974733304.

The spelling of 66675220 in words is "sixty-six million, six hundred seventy-five thousand, two hundred twenty".