66611166 has 16 divisors (see below), whose sum is σ = 133475088. Its totient is φ = 22161600.

The previous prime is 66611159. The next prime is 66611179. The reversal of 66611166 is 66111666.

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

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7015 + ... + 13506.

It is an arithmetic number, because the mean of its divisors is an integer number (8342193).

Almost surely, 2^66611166 is an apocalyptic number.

66611166 is an abundant number, since it is smaller than the sum of its proper divisors (66863922).

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

66611166 is a wasteful number, since it uses less digits than its factorization.

66611166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21067.

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

The square root of 66611166 is about 8161.5663937752. The cubic root of 66611166 is about 405.3675797100.

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

The spelling of 66611166 in words is "sixty-six million, six hundred eleven thousand, one hundred sixty-six".