66316559 has 2 divisors, whose sum is σ = 66316560. Its totient is φ = 66316558.

The previous prime is 66316529. The next prime is 66316561. The reversal of 66316559 is 95561366.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66316559 is a prime.

Together with 66316561, 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 (66316529) 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, 33158279 + 33158280.

It is an arithmetic number, because the mean of its divisors is an integer number (33158280).

Almost surely, 2^66316559 is an apocalyptic number.

66316559 is a deficient number, since it is larger than the sum of its proper divisors (1).

66316559 is an equidigital number, since it uses as much as digits as its factorization.

66316559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 41.

The square root of 66316559 is about 8143.4979584942. The cubic root of 66316559 is about 404.7690783370.

The spelling of 66316559 in words is "sixty-six million, three hundred sixteen thousand, five hundred fifty-nine".