216093889881 has 33 divisors (see below), whose sum is σ = 324308533759. Its totient is φ = 143987286096.

The previous prime is 216093889867. The next prime is 216093889889. The reversal of 216093889881 is 188988390612.

It is a happy number.

The square root of 216093889881 is 464859.

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

216093889881 is a `hidden beast` number, since 2 + 160 + 9 + 388 + 98 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 188143400025 + 27950489856 = 433755^2 + 167184^2 .

It is not a de Polignac number, because 216093889881 - 2⁵ = 216093889849 is a prime.

It is a super-2 number, since 2×216093889881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216093889889) by changing a digit.

It is a polite number, since it can be written in 32 ways as a sum of consecutive naturals, for example, 112959781 + ... + 112961693.

Almost surely, 2^216093889881 is an apocalyptic number.

216093889881 is the 464859-th square number.

216093889881 is the 232430-th centered octagonal number.

It is an amenable number.

216093889881 is a deficient number, since it is larger than the sum of its proper divisors (108214643878).

216093889881 is an frugal number, since it uses more digits than its factorization.

216093889881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3856 (or 1916 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 63.

The spelling of 216093889881 in words is "two hundred sixteen billion, ninety-three million, eight hundred eighty-nine thousand, eight hundred eighty-one".