66911966 has 16 divisors (see below), whose sum is σ = 115933680. Its totient is φ = 28625280.

The previous prime is 66911953. The next prime is 66912011.

66911966 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×66911966² = 8954422387970312, which contains 22 as substring.

It is a Curzon number.

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, 89081 + ... + 89828.

It is an arithmetic number, because the mean of its divisors is an integer number (7245855).

Almost surely, 2^66911966 is an apocalyptic number.

66911966 is a deficient number, since it is larger than the sum of its proper divisors (49021714).

66911966 is a wasteful number, since it uses less digits than its factorization.

66911966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178939.

The product of its digits is 104976, while the sum is 44.

The square root of 66911966 is about 8179.9734718396. The cubic root of 66911966 is about 405.9768443522.

The spelling of 66911966 in words is "sixty-six million, nine hundred eleven thousand, nine hundred sixty-six".