66697 has 2 divisors, whose sum is σ = 66698. Its totient is φ = 66696.

The previous prime is 66683. The next prime is 66701. The reversal of 66697 is 79666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35721 + 30976 = 189^2 + 176^2 .

It is a cyclic number.

It is not a de Polignac number, because 66697 - 2⁷ = 66569 is a prime.

It is not a weakly prime, because it can be changed into another prime (66617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33348 + 33349.

It is an arithmetic number, because the mean of its divisors is an integer number (33349).

2⁶⁶⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

66697 is a deficient number, since it is larger than the sum of its proper divisors (1).

66697 is an equidigital number, since it uses as much as digits as its factorization.

66697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 34.

The square root of 66697 is about 258.2576233144. The cubic root of 66697 is about 40.5541621534.

The spelling of 66697 in words is "sixty-six thousand, six hundred ninety-seven".