216503534943 has 24 divisors (see below), whose sum is σ = 321537093696. Its totient is φ = 140295628800.

The previous prime is 216503534927. The next prime is 216503535011. The reversal of 216503534943 is 349435305612.

216503534943 is a `hidden beast` number, since 2 + 1 + 6 + 503 + 53 + 4 + 94 + 3 = 666.

It is not a de Polignac number, because 216503534943 - 2⁴ = 216503534927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216503534543) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 982530 + ... + 1182527.

It is an arithmetic number, because the mean of its divisors is an integer number (13397378904).

Almost surely, 2^216503534943 is an apocalyptic number.

216503534943 is a deficient number, since it is larger than the sum of its proper divisors (105033558753).

216503534943 is a wasteful number, since it uses less digits than its factorization.

216503534943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165375 (or 2165372 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 45.

The spelling of 216503534943 in words is "two hundred sixteen billion, five hundred three million, five hundred thirty-four thousand, nine hundred forty-three".