66000497 has 2 divisors, whose sum is σ = 66000498. Its totient is φ = 66000496.

The previous prime is 66000479. The next prime is 66000499. The reversal of 66000497 is 79400066.

Together with previous prime (66000479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37442161 + 28558336 = 6119^2 + 5344^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66000497 is a prime.

Together with 66000499, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66000499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33000248 + 33000249.

It is an arithmetic number, because the mean of its divisors is an integer number (33000249).

Almost surely, 2^66000497 is an apocalyptic number.

It is an amenable number.

66000497 is a deficient number, since it is larger than the sum of its proper divisors (1).

66000497 is an equidigital number, since it uses as much as digits as its factorization.

66000497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 66000497 is about 8124.0689928139. The cubic root of 66000497 is about 404.1250164517.

The spelling of 66000497 in words is "sixty-six million, four hundred ninety-seven", and thus it is an aban number.