66325669 has 2 divisors, whose sum is σ = 66325670. Its totient is φ = 66325668.

The previous prime is 66325663. The next prime is 66325681. The reversal of 66325669 is 96652366.

It is a happy number.

66325669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62204769 + 4120900 = 7887^2 + 2030^2 .

It is a cyclic number.

It is not a de Polignac number, because 66325669 - 2³ = 66325661 is a prime.

It is a super-2 number, since 2×66325669² = 8798188736595122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66325661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33162834 + 33162835.

It is an arithmetic number, because the mean of its divisors is an integer number (33162835).

Almost surely, 2^66325669 is an apocalyptic number.

It is an amenable number.

66325669 is a deficient number, since it is larger than the sum of its proper divisors (1).

66325669 is an equidigital number, since it uses as much as digits as its factorization.

66325669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 43.

The square root of 66325669 is about 8144.0572812327. The cubic root of 66325669 is about 404.7876120563.

The spelling of 66325669 in words is "sixty-six million, three hundred twenty-five thousand, six hundred sixty-nine".