216534566 has 8 divisors (see below), whose sum is σ = 335279424. Its totient is φ = 104774760.

The previous prime is 216534533. The next prime is 216534569. The reversal of 216534566 is 665435612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216534569) 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, 1746185 + ... + 1746308.

It is an arithmetic number, because the mean of its divisors is an integer number (41909928).

Almost surely, 2^216534566 is an apocalyptic number.

216534566 is a deficient number, since it is larger than the sum of its proper divisors (118744858).

216534566 is a wasteful number, since it uses less digits than its factorization.

216534566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3492526.

The product of its digits is 129600, while the sum is 38.

The square root of 216534566 is about 14715.1135231775. The cubic root of 216534566 is about 600.4945607559.

The spelling of 216534566 in words is "two hundred sixteen million, five hundred thirty-four thousand, five hundred sixty-six".