216161688 has 32 divisors (see below), whose sum is σ = 552974400. Its totient is φ = 70377888.

The previous prime is 216161669. The next prime is 216161711. The reversal of 216161688 is 886161612.

216161688 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103698 + ... + 105761.

It is an arithmetic number, because the mean of its divisors is an integer number (17280450).

Almost surely, 2^216161688 is an apocalyptic number.

It is an amenable number.

216161688 is an abundant number, since it is smaller than the sum of its proper divisors (336812712).

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

216161688 is a wasteful number, since it uses less digits than its factorization.

216161688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209511 (or 209507 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The square root of 216161688 is about 14702.4381651480. The cubic root of 216161688 is about 600.1496737709.

The spelling of 216161688 in words is "two hundred sixteen million, one hundred sixty-one thousand, six hundred eighty-eight".