66111666 has 8 divisors (see below), whose sum is σ = 132223344. Its totient is φ = 22037220.

The previous prime is 66111631. The next prime is 66111673. The reversal of 66111666 is 66611166.

66111666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

66111666 is an admirable number.

It is a nude number because it is divisible by every one of its digits.

It is a zygodrome in base 10.

It is an unprimeable number.

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, 5509300 + ... + 5509311.

It is an arithmetic number, because the mean of its divisors is an integer number (16527918).

Almost surely, 2^66111666 is an apocalyptic number.

66111666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66111666 is a wasteful number, since it uses less digits than its factorization.

66111666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11018616.

The product of its digits is 7776, while the sum is 33.

The square root of 66111666 is about 8130.9080673686. The cubic root of 66111666 is about 404.3517873375.

Subtracting 66111666 from its reverse (66611166), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 66111666 in words is "sixty-six million, one hundred eleven thousand, six hundred sixty-six".