216304031345 has 4 divisors (see below), whose sum is σ = 259564837620. Its totient is φ = 173043225072.

The previous prime is 216304031309. The next prime is 216304031353. The reversal of 216304031345 is 543130403612.

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 106819809889 + 109484221456 = 326833^2 + 330884^2 .

It is a cyclic number.

It is not a de Polignac number, because 216304031345 - 2⁸ = 216304031089 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21630403130 + ... + 21630403139.

It is an arithmetic number, because the mean of its divisors is an integer number (64891209405).

Almost surely, 2^216304031345 is an apocalyptic number.

It is an amenable number.

216304031345 is a deficient number, since it is larger than the sum of its proper divisors (43260806275).

216304031345 is an equidigital number, since it uses as much as digits as its factorization.

216304031345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43260806274.

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 216304031345 its reverse (543130403612), we get a palindrome (759434434957).

The spelling of 216304031345 in words is "two hundred sixteen billion, three hundred four million, thirty-one thousand, three hundred forty-five".