216653305 has 32 divisors (see below), whose sum is σ = 290822400. Its totient is φ = 153619200.

The previous prime is 216653303. The next prime is 216653329. The reversal of 216653305 is 503356612.

It is not a de Polignac number, because 216653305 - 2¹ = 216653303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216653303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 425391 + ... + 425899.

It is an arithmetic number, because the mean of its divisors is an integer number (9088200).

Almost surely, 2^216653305 is an apocalyptic number.

It is an amenable number.

216653305 is a deficient number, since it is larger than the sum of its proper divisors (74169095).

216653305 is a wasteful number, since it uses less digits than its factorization.

216653305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 216653305 is about 14719.1475636329. The cubic root of 216653305 is about 600.6043031954.

The spelling of 216653305 in words is "two hundred sixteen million, six hundred fifty-three thousand, three hundred five".