216265404243 has 16 divisors (see below), whose sum is σ = 346891877120. Its totient is φ = 117076008096.

The previous prime is 216265404227. The next prime is 216265404259. The reversal of 216265404243 is 342404562612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (216265404227) and next prime (216265404259).

It is not a de Polignac number, because 216265404243 - 2⁴ = 216265404227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216265403243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271008880 + ... + 271009677.

It is an arithmetic number, because the mean of its divisors is an integer number (21680742320).

Almost surely, 2^216265404243 is an apocalyptic number.

216265404243 is a deficient number, since it is larger than the sum of its proper divisors (130626472877).

216265404243 is a wasteful number, since it uses less digits than its factorization.

216265404243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542018586.

The product of its (nonzero) digits is 276480, while the sum is 39.

Adding to 216265404243 its reverse (342404562612), we get a palindrome (558669966855).

The spelling of 216265404243 in words is "two hundred sixteen billion, two hundred sixty-five million, four hundred four thousand, two hundred forty-three".