66228219 has 8 divisors (see below), whose sum is σ = 98115920. Its totient is φ = 44152128.

The previous prime is 66228191. The next prime is 66228221. The reversal of 66228219 is 91282266.

It is a happy number.

66228219 is a `hidden beast` number, since 6 + 622 + 8 + 21 + 9 = 666.

It is not a de Polignac number, because 66228219 - 2¹³ = 66220027 is a prime.

It is a super-2 number, since 2×66228219² = 8772353983823922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66228259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1226422 + ... + 1226475.

It is an arithmetic number, because the mean of its divisors is an integer number (12264490).

Almost surely, 2^66228219 is an apocalyptic number.

66228219 is a deficient number, since it is larger than the sum of its proper divisors (31887701).

66228219 is a wasteful number, since it uses less digits than its factorization.

66228219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2452906 (or 2452900 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 66228219 is about 8138.0721918646. The cubic root of 66228219 is about 404.5892680952.

It can be divided in two parts, 6622 and 8219, that added together give a palindrome (14841).

The spelling of 66228219 in words is "sixty-six million, two hundred twenty-eight thousand, two hundred nineteen".