2166265571 has 2 divisors, whose sum is σ = 2166265572. Its totient is φ = 2166265570.

The previous prime is 2166265561. The next prime is 2166265609. The reversal of 2166265571 is 1755626612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2166265571 - 2¹⁴ = 2166249187 is a prime.

It is not a weakly prime, because it can be changed into another prime (2166265501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083132785 + 1083132786.

It is an arithmetic number, because the mean of its divisors is an integer number (1083132786).

Almost surely, 2^2166265571 is an apocalyptic number.

2166265571 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166265571 is an equidigital number, since it uses as much as digits as its factorization.

2166265571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 41.

The square root of 2166265571 is about 46543.1581545559. The cubic root of 2166265571 is about 1293.9094929479.

The spelling of 2166265571 in words is "two billion, one hundred sixty-six million, two hundred sixty-five thousand, five hundred seventy-one".