66198497 has 2 divisors, whose sum is σ = 66198498. Its totient is φ = 66198496.

The previous prime is 66198463. The next prime is 66198521. The reversal of 66198497 is 79489166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39891856 + 26306641 = 6316^2 + 5129^2 .

It is a cyclic number.

It is not a de Polignac number, because 66198497 - 2⁸ = 66198241 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66198437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33099248 + 33099249.

It is an arithmetic number, because the mean of its divisors is an integer number (33099249).

Almost surely, 2^66198497 is an apocalyptic number.

It is an amenable number.

66198497 is a deficient number, since it is larger than the sum of its proper divisors (1).

66198497 is an equidigital number, since it uses as much as digits as its factorization.

66198497 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 66198497 is about 8136.2458787822. The cubic root of 66198497 is about 404.5287349783.

The spelling of 66198497 in words is "sixty-six million, one hundred ninety-eight thousand, four hundred ninety-seven".