66489197 has 2 divisors, whose sum is σ = 66489198. Its totient is φ = 66489196.

The previous prime is 66489191. The next prime is 66489211. The reversal of 66489197 is 79198466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59274601 + 7214596 = 7699^2 + 2686^2 .

It is a cyclic number.

It is not a de Polignac number, because 66489197 - 2⁶ = 66489133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66489191) 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, 33244598 + 33244599.

It is an arithmetic number, because the mean of its divisors is an integer number (33244599).

Almost surely, 2^66489197 is an apocalyptic number.

It is an amenable number.

66489197 is a deficient number, since it is larger than the sum of its proper divisors (1).

66489197 is an equidigital number, since it uses as much as digits as its factorization.

66489197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 50.

The square root of 66489197 is about 8154.0908138185. The cubic root of 66489197 is about 405.1200111752.

The spelling of 66489197 in words is "sixty-six million, four hundred eighty-nine thousand, one hundred ninety-seven".