66321793 has 2 divisors, whose sum is σ = 66321794. Its totient is φ = 66321792.

The previous prime is 66321779. The next prime is 66321809. The reversal of 66321793 is 39712366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65561409 + 760384 = 8097^2 + 872^2 .

It is a cyclic number.

It is not a de Polignac number, because 66321793 - 2¹³ = 66313601 is a prime.

It is not a weakly prime, because it can be changed into another prime (66321193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33160896 + 33160897.

It is an arithmetic number, because the mean of its divisors is an integer number (33160897).

Almost surely, 2^66321793 is an apocalyptic number.

It is an amenable number.

66321793 is a deficient number, since it is larger than the sum of its proper divisors (1).

66321793 is an equidigital number, since it uses as much as digits as its factorization.

66321793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 37.

The square root of 66321793 is about 8143.8193128286. The cubic root of 66321793 is about 404.7797267866.

The spelling of 66321793 in words is "sixty-six million, three hundred twenty-one thousand, seven hundred ninety-three".