216180705 has 16 divisors (see below), whose sum is σ = 372496320. Its totient is φ = 106427328.

The previous prime is 216180641. The next prime is 216180709. The reversal of 216180705 is 507081612.

It is not a de Polignac number, because 216180705 - 2⁶ = 216180641 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216180709) 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, 554115 + ... + 554504.

It is an arithmetic number, because the mean of its divisors is an integer number (23281020).

Almost surely, 2^216180705 is an apocalyptic number.

It is an amenable number.

216180705 is a deficient number, since it is larger than the sum of its proper divisors (156315615).

216180705 is a wasteful number, since it uses less digits than its factorization.

216180705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108640.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 216180705 is about 14703.0848803916. The cubic root of 216180705 is about 600.1672728065.

The spelling of 216180705 in words is "two hundred sixteen million, one hundred eighty thousand, seven hundred five".