66973573 has 2 divisors, whose sum is σ = 66973574. Its totient is φ = 66973572.

The previous prime is 66973507. The next prime is 66973583. The reversal of 66973573 is 37537966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66048129 + 925444 = 8127^2 + 962^2 .

It is a cyclic number.

It is not a de Polignac number, because 66973573 - 2²¹ = 64876421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66973583) 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, 33486786 + 33486787.

It is an arithmetic number, because the mean of its divisors is an integer number (33486787).

Almost surely, 2^66973573 is an apocalyptic number.

It is an amenable number.

66973573 is a deficient number, since it is larger than the sum of its proper divisors (1).

66973573 is an equidigital number, since it uses as much as digits as its factorization.

66973573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 714420, while the sum is 46.

The square root of 66973573 is about 8183.7383267062. The cubic root of 66973573 is about 406.1014027576.

The spelling of 66973573 in words is "sixty-six million, nine hundred seventy-three thousand, five hundred seventy-three".