216666633 has 8 divisors (see below), whose sum is σ = 304093600. Its totient is φ = 136842048.

The previous prime is 216666631. The next prime is 216666641. The reversal of 216666633 is 336666612.

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 216666633 - 2¹ = 216666631 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 216666591 and 216666600.

It is not an unprimeable number, because it can be changed into a prime (216666631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1900528 + ... + 1900641.

It is an arithmetic number, because the mean of its divisors is an integer number (38011700).

Almost surely, 2^216666633 is an apocalyptic number.

It is an amenable number.

216666633 is a deficient number, since it is larger than the sum of its proper divisors (87426967).

216666633 is a wasteful number, since it uses less digits than its factorization.

216666633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3801191.

The product of its digits is 139968, while the sum is 39.

The square root of 216666633 is about 14719.6003002799. The cubic root of 216666633 is about 600.6166188627.

The spelling of 216666633 in words is "two hundred sixteen million, six hundred sixty-six thousand, six hundred thirty-three".