66216633 has 8 divisors (see below), whose sum is σ = 100901568. Its totient is φ = 37838064.

The previous prime is 66216611. The next prime is 66216637. The reversal of 66216633 is 33661266.

It is a happy number.

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

It is not a de Polignac number, because 66216633 - 2¹⁰ = 66215609 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66216594 and 66216603.

It is not an unprimeable number, because it can be changed into a prime (66216637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1576566 + ... + 1576607.

It is an arithmetic number, because the mean of its divisors is an integer number (12612696).

Almost surely, 2^66216633 is an apocalyptic number.

It is an amenable number.

66216633 is a deficient number, since it is larger than the sum of its proper divisors (34684935).

66216633 is a wasteful number, since it uses less digits than its factorization.

66216633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3153183.

The product of its digits is 23328, while the sum is 33.

The square root of 66216633 is about 8137.3603213819. The cubic root of 66216633 is about 404.5656736984.

Adding to 66216633 its reverse (33661266), we get a palindrome (99877899).

The spelling of 66216633 in words is "sixty-six million, two hundred sixteen thousand, six hundred thirty-three".