66573223 has 2 divisors, whose sum is σ = 66573224. Its totient is φ = 66573222.

The previous prime is 66573209. The next prime is 66573233. The reversal of 66573223 is 32237566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66573223 - 2¹⁷ = 66442151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66573233) 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 as a sum of consecutive naturals, namely, 33286611 + 33286612.

It is an arithmetic number, because the mean of its divisors is an integer number (33286612).

Almost surely, 2^66573223 is an apocalyptic number.

66573223 is a deficient number, since it is larger than the sum of its proper divisors (1).

66573223 is an equidigital number, since it uses as much as digits as its factorization.

66573223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 34.

The square root of 66573223 is about 8159.2415701461. The cubic root of 66573223 is about 405.2905967038.

The spelling of 66573223 in words is "sixty-six million, five hundred seventy-three thousand, two hundred twenty-three".