216564043 has 16 divisors (see below), whose sum is σ = 225792000. Its totient is φ = 207597312.

The previous prime is 216564031. The next prime is 216564059. The reversal of 216564043 is 340465612.

It is a cyclic number.

It is not a de Polignac number, because 216564043 - 2⁹ = 216563531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216563996 and 216564014.

It is not an unprimeable number, because it can be changed into a prime (216568043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 451878 + ... + 452356.

It is an arithmetic number, because the mean of its divisors is an integer number (14112000).

Almost surely, 2^216564043 is an apocalyptic number.

216564043 is a deficient number, since it is larger than the sum of its proper divisors (9227957).

216564043 is an equidigital number, since it uses as much as digits as its factorization.

216564043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 216564043 is about 14716.1150783758. The cubic root of 216564043 is about 600.5218080993.

The spelling of 216564043 in words is "two hundred sixteen million, five hundred sixty-four thousand, forty-three".