66317189 has 2 divisors, whose sum is σ = 66317190. Its totient is φ = 66317188.

The previous prime is 66317177. The next prime is 66317191. The reversal of 66317189 is 98171366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64272289 + 2044900 = 8017^2 + 1430^2 .

It is a cyclic number.

It is not a de Polignac number, because 66317189 - 2⁸ = 66316933 is a prime.

Together with 66317191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66317389) 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, 33158594 + 33158595.

It is an arithmetic number, because the mean of its divisors is an integer number (33158595).

Almost surely, 2^66317189 is an apocalyptic number.

It is an amenable number.

66317189 is a deficient number, since it is larger than the sum of its proper divisors (1).

66317189 is an equidigital number, since it uses as much as digits as its factorization.

66317189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 66317189 is about 8143.5366395688. The cubic root of 66317189 is about 404.7703600868.

The spelling of 66317189 in words is "sixty-six million, three hundred seventeen thousand, one hundred eighty-nine".