216543646 has 16 divisors (see below), whose sum is σ = 372994560. Its totient is φ = 93248280.

The previous prime is 216543631. The next prime is 216543659. The reversal of 216543646 is 646345612.

216543646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258606 + ... + 259441.

It is an arithmetic number, because the mean of its divisors is an integer number (23312160).

Almost surely, 2^216543646 is an apocalyptic number.

216543646 is a deficient number, since it is larger than the sum of its proper divisors (156450914).

216543646 is a wasteful number, since it uses less digits than its factorization.

216543646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518079.

The product of its digits is 103680, while the sum is 37.

The square root of 216543646 is about 14715.4220462751. The cubic root of 216543646 is about 600.5029542032.

The spelling of 216543646 in words is "two hundred sixteen million, five hundred forty-three thousand, six hundred forty-six".