216161616 has 40 divisors (see below), whose sum is σ = 609184224. Its totient is φ = 65503360.

The previous prime is 216161587. The next prime is 216161623. The reversal of 216161616 is 616161612.

It is a nude number because it is divisible by every one of its digits.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 204171 + ... + 205226.

Almost surely, 2^216161616 is an apocalyptic number.

It is an amenable number.

216161616 is an abundant number, since it is smaller than the sum of its proper divisors (393022608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216161616 is a wasteful number, since it uses less digits than its factorization.

216161616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409419 (or 409413 counting only the distinct ones).

The product of its digits is 2592, while the sum is 30.

The square root of 216161616 is about 14702.4357165743. The cubic root of 216161616 is about 600.1496071375.

It can be divided in two parts, 21616 and 1616, that added together give a palindrome (23232).

The spelling of 216161616 in words is "two hundred sixteen million, one hundred sixty-one thousand, six hundred sixteen".