66066257 has 4 divisors (see below), whose sum is σ = 66862320. Its totient is φ = 65270196.

The previous prime is 66066229. The next prime is 66066311. The reversal of 66066257 is 75266066.

66066257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66066257 - 2¹⁸ = 65804113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66066257.

It is not an unprimeable number, because it can be changed into a prime (66066227) 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 in 3 ways as a sum of consecutive naturals, for example, 397907 + ... + 398072.

It is an arithmetic number, because the mean of its divisors is an integer number (16715580).

Almost surely, 2^66066257 is an apocalyptic number.

It is an amenable number.

66066257 is a deficient number, since it is larger than the sum of its proper divisors (796063).

66066257 is an equidigital number, since it uses as much as digits as its factorization.

66066257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796062.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 66066257 is about 8128.1152181794. The cubic root of 66066257 is about 404.2591893799.

The spelling of 66066257 in words is "sixty-six million, sixty-six thousand, two hundred fifty-seven".