216559655 has 16 divisors (see below), whose sum is σ = 282641184. Its totient is φ = 158332800.

The previous prime is 216559633. The next prime is 216559657. The reversal of 216559655 is 556955612.

It is not a de Polignac number, because 216559655 - 2⁶ = 216559591 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 (216559657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9929 + ... + 23058.

It is an arithmetic number, because the mean of its divisors is an integer number (17665074).

Almost surely, 2^216559655 is an apocalyptic number.

216559655 is a deficient number, since it is larger than the sum of its proper divisors (66081529).

216559655 is a wasteful number, since it uses less digits than its factorization.

216559655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33106.

The product of its digits is 405000, while the sum is 44.

The square root of 216559655 is about 14715.9659893600. The cubic root of 216559655 is about 600.5177521667.

The spelling of 216559655 in words is "two hundred sixteen million, five hundred fifty-nine thousand, six hundred fifty-five".