66645166 has 8 divisors (see below), whose sum is σ = 114248880. Its totient is φ = 28562208.

The previous prime is 66645149. The next prime is 66645169. The reversal of 66645166 is 66154666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66645169) 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 3 ways as a sum of consecutive naturals, for example, 2380171 + ... + 2380198.

It is an arithmetic number, because the mean of its divisors is an integer number (14281110).

Almost surely, 2^66645166 is an apocalyptic number.

66645166 is a deficient number, since it is larger than the sum of its proper divisors (47603714).

66645166 is a wasteful number, since it uses less digits than its factorization.

66645166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4760378.

The product of its digits is 155520, while the sum is 40.

The square root of 66645166 is about 8163.6490615410. The cubic root of 66645166 is about 405.4365378854.

The spelling of 66645166 in words is "sixty-six million, six hundred forty-five thousand, one hundred sixty-six".