216816061 has 8 divisors (see below), whose sum is σ = 270316224. Its totient is φ = 168947520.

The previous prime is 216816043. The next prime is 216816071. The reversal of 216816061 is 160618612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-216816061 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 (216816001) by changing a digit.

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, 1407820 + ... + 1407973.

It is an arithmetic number, because the mean of its divisors is an integer number (33789528).

Almost surely, 2^216816061 is an apocalyptic number.

It is an amenable number.

216816061 is a deficient number, since it is larger than the sum of its proper divisors (53500163).

216816061 is a wasteful number, since it uses less digits than its factorization.

216816061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2815811.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 216816061 is about 14724.6752425987. The cubic root of 216816061 is about 600.7546624467.

The spelling of 216816061 in words is "two hundred sixteen million, eight hundred sixteen thousand, sixty-one".