216806683 has 4 divisors (see below), whose sum is σ = 216836568. Its totient is φ = 216776800.

The previous prime is 216806677. The next prime is 216806713. The reversal of 216806683 is 386608612.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216806683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216806633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3660 + ... + 21142.

It is an arithmetic number, because the mean of its divisors is an integer number (54209142).

Almost surely, 2^216806683 is an apocalyptic number.

216806683 is a deficient number, since it is larger than the sum of its proper divisors (29885).

216806683 is a wasteful number, since it uses less digits than its factorization.

216806683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29884.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 216806683 is about 14724.3567941014. The cubic root of 216806683 is about 600.7460007907.

The spelling of 216806683 in words is "two hundred sixteen million, eight hundred six thousand, six hundred eighty-three".