66973843 has 2 divisors, whose sum is σ = 66973844. Its totient is φ = 66973842.

The previous prime is 66973799. The next prime is 66973849. The reversal of 66973843 is 34837966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66973843 - 2¹³ = 66965651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66973793 and 66973802.

It is not a weakly prime, because it can be changed into another prime (66973849) 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, 33486921 + 33486922.

It is an arithmetic number, because the mean of its divisors is an integer number (33486922).

Almost surely, 2^66973843 is an apocalyptic number.

66973843 is a deficient number, since it is larger than the sum of its proper divisors (1).

66973843 is an equidigital number, since it uses as much as digits as its factorization.

66973843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 46.

The square root of 66973843 is about 8183.7548228182. The cubic root of 66973843 is about 406.1019484815.

The spelling of 66973843 in words is "sixty-six million, nine hundred seventy-three thousand, eight hundred forty-three".