66332197 has 2 divisors, whose sum is σ = 66332198. Its totient is φ = 66332196.

The previous prime is 66332183. The next prime is 66332221. The reversal of 66332197 is 79123366.

66332197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34680321 + 31651876 = 5889^2 + 5626^2 .

It is a cyclic number.

It is not a de Polignac number, because 66332197 - 2¹⁹ = 65807909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66332177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33166098 + 33166099.

It is an arithmetic number, because the mean of its divisors is an integer number (33166099).

Almost surely, 2^66332197 is an apocalyptic number.

It is an amenable number.

66332197 is a deficient number, since it is larger than the sum of its proper divisors (1).

66332197 is an equidigital number, since it uses as much as digits as its factorization.

66332197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 37.

The square root of 66332197 is about 8144.4580544073. The cubic root of 66332197 is about 404.8008918160.

The spelling of 66332197 in words is "sixty-six million, three hundred thirty-two thousand, one hundred ninety-seven".