66009497 has 2 divisors, whose sum is σ = 66009498. Its totient is φ = 66009496.

The previous prime is 66009491. The next prime is 66009523. The reversal of 66009497 is 79490066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58079641 + 7929856 = 7621^2 + 2816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66009497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66009491) 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, 33004748 + 33004749.

It is an arithmetic number, because the mean of its divisors is an integer number (33004749).

Almost surely, 2^66009497 is an apocalyptic number.

It is an amenable number.

66009497 is a deficient number, since it is larger than the sum of its proper divisors (1).

66009497 is an equidigital number, since it uses as much as digits as its factorization.

66009497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 66009497 is about 8124.6228835559. The cubic root of 66009497 is about 404.1433847974.

The spelling of 66009497 in words is "sixty-six million, nine thousand, four hundred ninety-seven".