216750561 has 32 divisors (see below), whose sum is σ = 313050240. Its totient is φ = 132903936.

The previous prime is 216750557. The next prime is 216750571. The reversal of 216750561 is 165057612.

It is not a de Polignac number, because 216750561 - 2² = 216750557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216750571) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 782355 + ... + 782631.

It is an arithmetic number, because the mean of its divisors is an integer number (9782820).

Almost surely, 2^216750561 is an apocalyptic number.

It is an amenable number.

216750561 is a deficient number, since it is larger than the sum of its proper divisors (96299679).

216750561 is a wasteful number, since it uses less digits than its factorization.

216750561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 216750561 is about 14722.4509168820. The cubic root of 216750561 is about 600.6941604812.

The spelling of 216750561 in words is "two hundred sixteen million, seven hundred fifty thousand, five hundred sixty-one".