66837317 has 2 divisors, whose sum is σ = 66837318. Its totient is φ = 66837316.

The previous prime is 66837283. The next prime is 66837343. The reversal of 66837317 is 71373866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44502241 + 22335076 = 6671^2 + 4726^2 .

It is a cyclic number.

It is not a de Polignac number, because 66837317 - 2⁸ = 66837061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66837367) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33418658 + 33418659.

It is an arithmetic number, because the mean of its divisors is an integer number (33418659).

Almost surely, 2^66837317 is an apocalyptic number.

It is an amenable number.

66837317 is a deficient number, since it is larger than the sum of its proper divisors (1).

66837317 is an equidigital number, since it uses as much as digits as its factorization.

66837317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 41.

The square root of 66837317 is about 8175.4092863905. The cubic root of 66837317 is about 405.8258148515.

The spelling of 66837317 in words is "sixty-six million, eight hundred thirty-seven thousand, three hundred seventeen".