66218986 has 8 divisors (see below), whose sum is σ = 99606240. Its totient is φ = 33016908.

The previous prime is 66218963. The next prime is 66218993. The reversal of 66218986 is 68981266.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45396 + ... + 46831.

It is an arithmetic number, because the mean of its divisors is an integer number (12450780).

Almost surely, 2^66218986 is an apocalyptic number.

66218986 is a deficient number, since it is larger than the sum of its proper divisors (33387254).

66218986 is a wasteful number, since it uses less digits than its factorization.

66218986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92588.

The product of its digits is 248832, while the sum is 46.

The square root of 66218986 is about 8137.5049001521. The cubic root of 66218986 is about 404.5704657056.

The spelling of 66218986 in words is "sixty-six million, two hundred eighteen thousand, nine hundred eighty-six".