66745873 has 2 divisors, whose sum is σ = 66745874. Its totient is φ = 66745872.

The previous prime is 66745853. The next prime is 66745963. The reversal of 66745873 is 37854766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59166864 + 7579009 = 7692^2 + 2753^2 .

It is a cyclic number.

It is not a de Polignac number, because 66745873 - 2¹³ = 66737681 is a prime.

It is not a weakly prime, because it can be changed into another prime (66745813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33372936 + 33372937.

It is an arithmetic number, because the mean of its divisors is an integer number (33372937).

Almost surely, 2^66745873 is an apocalyptic number.

It is an amenable number.

66745873 is a deficient number, since it is larger than the sum of its proper divisors (1).

66745873 is an equidigital number, since it uses as much as digits as its factorization.

66745873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 46.

The square root of 66745873 is about 8169.8147469817. The cubic root of 66745873 is about 405.6406524571.

The spelling of 66745873 in words is "sixty-six million, seven hundred forty-five thousand, eight hundred seventy-three".