2166745671371 has 2 divisors, whose sum is σ = 2166745671372. Its totient is φ = 2166745671370.

The previous prime is 2166745671317. The next prime is 2166745671463. The reversal of 2166745671371 is 1731765476612.

Together with previous prime (2166745671317) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2166745671371 - 2³⁴ = 2149565802187 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2166745673371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083372835685 + 1083372835686.

It is an arithmetic number, because the mean of its divisors is an integer number (1083372835686).

Almost surely, 2^{2166745671371} is an apocalyptic number.

2166745671371 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166745671371 is an equidigital number, since it uses as much as digits as its factorization.

2166745671371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8890560, while the sum is 56.

The spelling of 2166745671371 in words is "two trillion, one hundred sixty-six billion, seven hundred forty-five million, six hundred seventy-one thousand, three hundred seventy-one".