816241934243 has 4 divisors (see below), whose sum is σ = 816589717560. Its totient is φ = 815894150928.

The previous prime is 816241934239. The next prime is 816241934297. The reversal of 816241934243 is 342439142618.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342439142618 = 2 ⋅171219571309.

It is a cyclic number.

It is not a de Polignac number, because 816241934243 - 2² = 816241934239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816241934203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173888138 + ... + 173892831.

It is an arithmetic number, because the mean of its divisors is an integer number (204147429390).

Almost surely, 2^816241934243 is an apocalyptic number.

816241934243 is a deficient number, since it is larger than the sum of its proper divisors (347783317).

816241934243 is a wasteful number, since it uses less digits than its factorization.

816241934243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347783316.

The product of its digits is 995328, while the sum is 47.

The spelling of 816241934243 in words is "eight hundred sixteen billion, two hundred forty-one million, nine hundred thirty-four thousand, two hundred forty-three".