216566115211 has 16 divisors (see below), whose sum is σ = 224737748928. Its totient is φ = 208543795200.

The previous prime is 216566115209. The next prime is 216566115217. The reversal of 216566115211 is 112511665612.

216566115211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 216566115211 - 2¹ = 216566115209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216566115217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1410426 + ... + 1556416.

It is an arithmetic number, because the mean of its divisors is an integer number (14046109308).

Almost surely, 2^216566115211 is an apocalyptic number.

216566115211 is a deficient number, since it is larger than the sum of its proper divisors (8171633717).

216566115211 is a wasteful number, since it uses less digits than its factorization.

216566115211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146502.

The product of its digits is 21600, while the sum is 37.

The spelling of 216566115211 in words is "two hundred sixteen billion, five hundred sixty-six million, one hundred fifteen thousand, two hundred eleven".