66223393 has 2 divisors, whose sum is σ = 66223394. Its totient is φ = 66223392.

The previous prime is 66223373. The next prime is 66223411. The reversal of 66223393 is 39332266.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56130064 + 10093329 = 7492^2 + 3177^2 .

It is a cyclic number.

It is not a de Polignac number, because 66223393 - 2¹⁷ = 66092321 is a prime.

It is not a weakly prime, because it can be changed into another prime (66223343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33111696 + 33111697.

It is an arithmetic number, because the mean of its divisors is an integer number (33111697).

Almost surely, 2^66223393 is an apocalyptic number.

It is an amenable number.

66223393 is a deficient number, since it is larger than the sum of its proper divisors (1).

66223393 is an equidigital number, since it uses as much as digits as its factorization.

66223393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 34.

The square root of 66223393 is about 8137.7756788941. The cubic root of 66223393 is about 404.5794404856.

The spelling of 66223393 in words is "sixty-six million, two hundred twenty-three thousand, three hundred ninety-three".