66695897 has 2 divisors, whose sum is σ = 66695898. Its totient is φ = 66695896.

The previous prime is 66695873. The next prime is 66695903. The reversal of 66695897 is 79859666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66520336 + 175561 = 8156^2 + 419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66695897 is a prime.

It is not a weakly prime, because it can be changed into another prime (66695857) 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, 33347948 + 33347949.

It is an arithmetic number, because the mean of its divisors is an integer number (33347949).

Almost surely, 2^66695897 is an apocalyptic number.

It is an amenable number.

66695897 is a deficient number, since it is larger than the sum of its proper divisors (1).

66695897 is an equidigital number, since it uses as much as digits as its factorization.

66695897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4898880, while the sum is 56.

The square root of 66695897 is about 8166.7555981552. The cubic root of 66695897 is about 405.5393859764.

The spelling of 66695897 in words is "sixty-six million, six hundred ninety-five thousand, eight hundred ninety-seven".