2166443917 has 8 divisors (see below), whose sum is σ = 2366524512. Its totient is φ = 1966885200.

The previous prime is 2166443911. The next prime is 2166443933. The reversal of 2166443917 is 7193446612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2166443917 - 2³¹ = 18960269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166443911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121759 + ... + 138412.

It is an arithmetic number, because the mean of its divisors is an integer number (295815564).

Almost surely, 2^2166443917 is an apocalyptic number.

It is an amenable number.

2166443917 is a deficient number, since it is larger than the sum of its proper divisors (200080595).

2166443917 is a wasteful number, since it uses less digits than its factorization.

2166443917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260939.

The product of its digits is 217728, while the sum is 43.

The square root of 2166443917 is about 46545.0740358204. The cubic root of 2166443917 is about 1293.9450006365.

The spelling of 2166443917 in words is "two billion, one hundred sixty-six million, four hundred forty-three thousand, nine hundred seventeen".