216103187161 has 9 divisors (see below), whose sum is σ = 216741471093. Its totient is φ = 215466781500.

The previous prime is 216103187129. The next prime is 216103187239. The reversal of 216103187161 is 161781301612.

It is a happy number.

The square root of 216103187161 is 464869.

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

It is not a de Polignac number, because 216103187161 - 2⁵ = 216103187129 is a prime.

It is a super-2 number, since 2×216103187161² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216103187161.

It is not an unprimeable number, because it can be changed into a prime (216103184161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 287753536 + ... + 287754286.

It is an arithmetic number, because the mean of its divisors is an integer number (24082385677).

Almost surely, 2^216103187161 is an apocalyptic number.

216103187161 is the 464869-th square number.

216103187161 is the 232435-th centered octagonal number.

It is an amenable number.

216103187161 is a deficient number, since it is larger than the sum of its proper divisors (638283932).

216103187161 is an frugal number, since it uses more digits than its factorization.

216103187161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2740 (or 1370 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 37.

Adding to 216103187161 its reverse (161781301612), we get a palindrome (377884488773).

The spelling of 216103187161 in words is "two hundred sixteen billion, one hundred three million, one hundred eighty-seven thousand, one hundred sixty-one".