66125666 has 16 divisors (see below), whose sum is σ = 104129280. Its totient is φ = 31452240.

The previous prime is 66125659. The next prime is 66125669. The reversal of 66125666 is 66652166.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66125669) 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 in 7 ways as a sum of consecutive naturals, for example, 5381 + ... + 12696.

It is an arithmetic number, because the mean of its divisors is an integer number (6508080).

Almost surely, 2^66125666 is an apocalyptic number.

66125666 is a deficient number, since it is larger than the sum of its proper divisors (38003614).

66125666 is a wasteful number, since it uses less digits than its factorization.

66125666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18169.

The product of its digits is 77760, while the sum is 38.

The square root of 66125666 is about 8131.7689342479. The cubic root of 66125666 is about 404.3803275625.

The spelling of 66125666 in words is "sixty-six million, one hundred twenty-five thousand, six hundred sixty-six".