216675534493 has 4 divisors (see below), whose sum is σ = 236373310368. Its totient is φ = 196977758620.

The previous prime is 216675534487. The next prime is 216675534571. The reversal of 216675534493 is 394435576612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216675534493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216675534433) 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, 9848887921 + ... + 9848887942.

It is an arithmetic number, because the mean of its divisors is an integer number (59093327592).

Almost surely, 2^216675534493 is an apocalyptic number.

It is an amenable number.

216675534493 is a deficient number, since it is larger than the sum of its proper divisors (19697775875).

216675534493 is a wasteful number, since it uses less digits than its factorization.

216675534493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19697775874.

The product of its digits is 16329600, while the sum is 55.

The spelling of 216675534493 in words is "two hundred sixteen billion, six hundred seventy-five million, five hundred thirty-four thousand, four hundred ninety-three".