66580273 has 2 divisors, whose sum is σ = 66580274. Its totient is φ = 66580272.

The previous prime is 66580253. The next prime is 66580301. The reversal of 66580273 is 37208566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59783824 + 6796449 = 7732^2 + 2607^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66580273 is a prime.

It is not a weakly prime, because it can be changed into another prime (66580223) 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, 33290136 + 33290137.

It is an arithmetic number, because the mean of its divisors is an integer number (33290137).

Almost surely, 2^66580273 is an apocalyptic number.

It is an amenable number.

66580273 is a deficient number, since it is larger than the sum of its proper divisors (1).

66580273 is an equidigital number, since it uses as much as digits as its factorization.

66580273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 66580273 is about 8159.6735841576. The cubic root of 66580273 is about 405.3049027452.

The spelling of 66580273 in words is "sixty-six million, five hundred eighty thousand, two hundred seventy-three".