66355193 has 2 divisors, whose sum is σ = 66355194. Its totient is φ = 66355192.

The previous prime is 66355187. The next prime is 66355217. The reversal of 66355193 is 39155366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60264169 + 6091024 = 7763^2 + 2468^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66355193 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_3915965 and since 66355193 and 3915965 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (66355123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33177596 + 33177597.

It is an arithmetic number, because the mean of its divisors is an integer number (33177597).

Almost surely, 2^66355193 is an apocalyptic number.

It is an amenable number.

66355193 is a deficient number, since it is larger than the sum of its proper divisors (1).

66355193 is an equidigital number, since it uses as much as digits as its factorization.

66355193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72900, while the sum is 38.

The square root of 66355193 is about 8145.8696896034. The cubic root of 66355193 is about 404.8476651087.

The spelling of 66355193 in words is "sixty-six million, three hundred fifty-five thousand, one hundred ninety-three".