216161716 has 6 divisors (see below), whose sum is σ = 378283010. Its totient is φ = 108080856.

The previous prime is 216161713. The next prime is 216161801. The reversal of 216161716 is 617161612.

It can be written as a sum of positive squares in only one way, i.e., 209380900 + 6780816 = 14470^2 + 2604^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216161711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27020211 + ... + 27020218.

Almost surely, 2^216161716 is an apocalyptic number.

It is an amenable number.

216161716 is a deficient number, since it is larger than the sum of its proper divisors (162121294).

216161716 is a wasteful number, since it uses less digits than its factorization.

216161716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54040433 (or 54040431 counting only the distinct ones).

The product of its digits is 3024, while the sum is 31.

The square root of 216161716 is about 14702.4391173710. The cubic root of 216161716 is about 600.1496996839.

It can be divided in two parts, 21616 and 1716, that added together give a palindrome (23332).

The spelling of 216161716 in words is "two hundred sixteen million, one hundred sixty-one thousand, seven hundred sixteen".