66675317 has 2 divisors, whose sum is σ = 66675318. Its totient is φ = 66675316.

The previous prime is 66675293. The next prime is 66675331. The reversal of 66675317 is 71357666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54745201 + 11930116 = 7399^2 + 3454^2 .

It is a cyclic number.

It is not a de Polignac number, because 66675317 - 2⁶ = 66675253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66675337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33337658 + 33337659.

It is an arithmetic number, because the mean of its divisors is an integer number (33337659).

Almost surely, 2^66675317 is an apocalyptic number.

It is an amenable number.

66675317 is a deficient number, since it is larger than the sum of its proper divisors (1).

66675317 is an equidigital number, since it uses as much as digits as its factorization.

66675317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 41.

The square root of 66675317 is about 8165.4955146641. The cubic root of 66675317 is about 405.4976699713.

The spelling of 66675317 in words is "sixty-six million, six hundred seventy-five thousand, three hundred seventeen".