66366389 has 2 divisors, whose sum is σ = 66366390. Its totient is φ = 66366388.

The previous prime is 66366367. The next prime is 66366409. The reversal of 66366389 is 98366366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49210225 + 17156164 = 7015^2 + 4142^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66366389 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66366359) 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, 33183194 + 33183195.

It is an arithmetic number, because the mean of its divisors is an integer number (33183195).

Almost surely, 2^66366389 is an apocalyptic number.

It is an amenable number.

66366389 is a deficient number, since it is larger than the sum of its proper divisors (1).

66366389 is an equidigital number, since it uses as much as digits as its factorization.

66366389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 47.

The square root of 66366389 is about 8146.5568800568. The cubic root of 66366389 is about 404.8704335831.

The spelling of 66366389 in words is "sixty-six million, three hundred sixty-six thousand, three hundred eighty-nine".