216653618 has 16 divisors (see below), whose sum is σ = 344785920. Its totient is φ = 101815056.

The previous prime is 216653603. The next prime is 216653621. The reversal of 216653618 is 816356612.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17621 + ... + 27272.

It is an arithmetic number, because the mean of its divisors is an integer number (21549120).

Almost surely, 2^216653618 is an apocalyptic number.

216653618 is a deficient number, since it is larger than the sum of its proper divisors (128132302).

216653618 is a wasteful number, since it uses less digits than its factorization.

216653618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45041.

The product of its digits is 51840, while the sum is 38.

The square root of 216653618 is about 14719.1581960383. The cubic root of 216653618 is about 600.6045924272.

The spelling of 216653618 in words is "two hundred sixteen million, six hundred fifty-three thousand, six hundred eighteen".