216123461161 has 4 divisors (see below), whose sum is σ = 216206048212. Its totient is φ = 216040874112.

The previous prime is 216123461137. The next prime is 216123461173. The reversal of 216123461161 is 161164321612.

216123461161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 196210017936 + 19913443225 = 442956^2 + 141115^2 .

It is a cyclic number.

It is not a de Polignac number, because 216123461161 - 2²³ = 216115072553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216123461101) 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 3 ways as a sum of consecutive naturals, for example, 41289600 + ... + 41294833.

It is an arithmetic number, because the mean of its divisors is an integer number (54051512053).

Almost surely, 2^216123461161 is an apocalyptic number.

It is an amenable number.

216123461161 is a deficient number, since it is larger than the sum of its proper divisors (82587051).

216123461161 is an equidigital number, since it uses as much as digits as its factorization.

216123461161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82587050.

The product of its digits is 10368, while the sum is 34.

Adding to 216123461161 its reverse (161164321612), we get a palindrome (377287782773).

The spelling of 216123461161 in words is "two hundred sixteen billion, one hundred twenty-three million, four hundred sixty-one thousand, one hundred sixty-one".