2166716217 has 16 divisors (see below), whose sum is σ = 2961262080. Its totient is φ = 1408368000.

The previous prime is 2166716143. The next prime is 2166716221. The reversal of 2166716217 is 7126176612.

It is not a de Polignac number, because 2166716217 - 2⁸ = 2166715961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2166716297) 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, 235459 + ... + 244487.

It is an arithmetic number, because the mean of its divisors is an integer number (185078880).

Almost surely, 2^2166716217 is an apocalyptic number.

It is an amenable number.

2166716217 is a deficient number, since it is larger than the sum of its proper divisors (794545863).

2166716217 is a wasteful number, since it uses less digits than its factorization.

2166716217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11024.

The product of its digits is 42336, while the sum is 39.

The square root of 2166716217 is about 46547.9990654808. Note that the first 3 decimals coincide. The cubic root of 2166716217 is about 1293.9992102809. Note that the first 3 decimals are identical.

The spelling of 2166716217 in words is "two billion, one hundred sixty-six million, seven hundred sixteen thousand, two hundred seventeen".