216605653 has 16 divisors (see below), whose sum is σ = 251142336. Its totient is φ = 184631040.

The previous prime is 216605639. The next prime is 216605671. The reversal of 216605653 is 356506612.

It is not a de Polignac number, because 216605653 - 2¹³ = 216597461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216605953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50875 + ... + 54967.

It is an arithmetic number, because the mean of its divisors is an integer number (15696396).

Almost surely, 2^216605653 is an apocalyptic number.

It is an amenable number.

216605653 is a deficient number, since it is larger than the sum of its proper divisors (34536683).

216605653 is a wasteful number, since it uses less digits than its factorization.

216605653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4404.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 216605653 is about 14717.5287667461. The cubic root of 216605653 is about 600.5602664877.

The spelling of 216605653 in words is "two hundred sixteen million, six hundred five thousand, six hundred fifty-three".