216502687243 has 4 divisors (see below), whose sum is σ = 223486644928. Its totient is φ = 209518729560.

The previous prime is 216502687169. The next prime is 216502687321. The reversal of 216502687243 is 342786205612.

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

It is a cyclic number.

It is not a de Polignac number, because 216502687243 - 2³³ = 207912752651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216502687193 and 216502687202.

It is not an unprimeable number, because it can be changed into a prime (216502684243) 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, 3491978796 + ... + 3491978857.

It is an arithmetic number, because the mean of its divisors is an integer number (55871661232).

Almost surely, 2^216502687243 is an apocalyptic number.

216502687243 is a deficient number, since it is larger than the sum of its proper divisors (6983957685).

216502687243 is an equidigital number, since it uses as much as digits as its factorization.

216502687243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6983957684.

The product of its (nonzero) digits is 967680, while the sum is 46.

The spelling of 216502687243 in words is "two hundred sixteen billion, five hundred two million, six hundred eighty-seven thousand, two hundred forty-three".