2166365387 has 2 divisors, whose sum is σ = 2166365388. Its totient is φ = 2166365386.

The previous prime is 2166365371. The next prime is 2166365393. The reversal of 2166365387 is 7835636612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2166365387 - 2⁴ = 2166365371 is a prime.

It is not a weakly prime, because it can be changed into another prime (2166365317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083182693 + 1083182694.

It is an arithmetic number, because the mean of its divisors is an integer number (1083182694).

Almost surely, 2^2166365387 is an apocalyptic number.

2166365387 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166365387 is an equidigital number, since it uses as much as digits as its factorization.

2166365387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 47.

The square root of 2166365387 is about 46544.2304372948. The cubic root of 2166365387 is about 1293.9293659940.

The spelling of 2166365387 in words is "two billion, one hundred sixty-six million, three hundred sixty-five thousand, three hundred eighty-seven".