66197069 has 2 divisors, whose sum is σ = 66197070. Its totient is φ = 66197068.

The previous prime is 66197039. The next prime is 66197077. The reversal of 66197069 is 96079166.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53509225 + 12687844 = 7315^2 + 3562^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66197069 is a prime.

It is a super-2 number, since 2×66197069² = 8764103888381522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66197029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33098534 + 33098535.

It is an arithmetic number, because the mean of its divisors is an integer number (33098535).

Almost surely, 2^66197069 is an apocalyptic number.

It is an amenable number.

66197069 is a deficient number, since it is larger than the sum of its proper divisors (1).

66197069 is an equidigital number, since it uses as much as digits as its factorization.

66197069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 66197069 is about 8136.1581228489. The cubic root of 66197069 is about 404.5258261953.

The spelling of 66197069 in words is "sixty-six million, one hundred ninety-seven thousand, sixty-nine".