216558068164 has 27 divisors (see below), whose sum is σ = 402610114893. Its totient is φ = 101902233408.

The previous prime is 216558068161. The next prime is 216558068171. The reversal of 216558068164 is 461860855612.

The square root of 216558068164 is 465358.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 168600572100 + 47957496064 = 410610^2 + 218992^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216558068161) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15815329 + ... + 15829015.

Almost surely, 2^216558068164 is an apocalyptic number.

216558068164 is the 465358-th square number.

It is an amenable number.

216558068164 is a deficient number, since it is larger than the sum of its proper divisors (186052046729).

216558068164 is an frugal number, since it uses more digits than its factorization.

216558068164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27412 (or 13706 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 52.

The spelling of 216558068164 in words is "two hundred sixteen billion, five hundred fifty-eight million, sixty-eight thousand, one hundred sixty-four".