66231866 has 16 divisors (see below), whose sum is σ = 101666880. Its totient is φ = 32350080.

The previous prime is 66231857. The next prime is 66231871. The reversal of 66231866 is 66813266.

It is a Curzon 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, 18026 + ... + 21386.

It is an arithmetic number, because the mean of its divisors is an integer number (6354180).

Almost surely, 2^66231866 is an apocalyptic number.

66231866 is a deficient number, since it is larger than the sum of its proper divisors (35435014).

66231866 is a wasteful number, since it uses less digits than its factorization.

66231866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3589.

The product of its digits is 62208, while the sum is 38.

The square root of 66231866 is about 8138.2962590459. The cubic root of 66231866 is about 404.5966944863.

The spelling of 66231866 in words is "sixty-six million, two hundred thirty-one thousand, eight hundred sixty-six".