66866866 has 32 divisors (see below), whose sum is σ = 113892480. Its totient is φ = 29164800.

The previous prime is 66866861. The next prime is 66866873.

66866866 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (66866861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198250 + ... + 198586.

It is an arithmetic number, because the mean of its divisors is an integer number (3559140).

Almost surely, 2^66866866 is an apocalyptic number.

66866866 is a deficient number, since it is larger than the sum of its proper divisors (47025614).

66866866 is a wasteful number, since it uses less digits than its factorization.

66866866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690.

The product of its digits is 2985984, while the sum is 52.

The square root of 66866866 is about 8177.2162745032. The cubic root of 66866866 is about 405.8856116875.

The spelling of 66866866 in words is "sixty-six million, eight hundred sixty-six thousand, eight hundred sixty-six".