66223605 has 16 divisors (see below), whose sum is σ = 121094784. Its totient is φ = 30273600.

The previous prime is 66223603. The next prime is 66223609. The reversal of 66223605 is 50632266.

It is not a de Polignac number, because 66223605 - 2¹ = 66223603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66223603) 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 15 ways as a sum of consecutive naturals, for example, 315246 + ... + 315455.

It is an arithmetic number, because the mean of its divisors is an integer number (7568424).

Almost surely, 2^66223605 is an apocalyptic number.

It is an amenable number.

66223605 is a deficient number, since it is larger than the sum of its proper divisors (54871179).

66223605 is a wasteful number, since it uses less digits than its factorization.

66223605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630716.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 66223605 is about 8137.7887045560. The cubic root of 66223605 is about 404.5798722100.

The spelling of 66223605 in words is "sixty-six million, two hundred twenty-three thousand, six hundred five".