2166343871 has 2 divisors, whose sum is σ = 2166343872. Its totient is φ = 2166343870.

The previous prime is 2166343859. The next prime is 2166343901. The reversal of 2166343871 is 1783436612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2166343871 - 2²² = 2162149567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166343811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083171935 + 1083171936.

It is an arithmetic number, because the mean of its divisors is an integer number (1083171936).

Almost surely, 2^2166343871 is an apocalyptic number.

2166343871 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166343871 is an equidigital number, since it uses as much as digits as its factorization.

2166343871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 41.

The square root of 2166343871 is about 46543.9993017360. Note that the first 3 decimals coincide. The cubic root of 2166343871 is about 1293.9250822789.

The spelling of 2166343871 in words is "two billion, one hundred sixty-six million, three hundred forty-three thousand, eight hundred seventy-one".