2166595789 has 2 divisors, whose sum is σ = 2166595790. Its totient is φ = 2166595788.

The previous prime is 2166595757. The next prime is 2166595811. The reversal of 2166595789 is 9875956612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1444760100 + 721835689 = 38010^2 + 26867^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166595789 - 2⁵ = 2166595757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166695789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083297894 + 1083297895.

It is an arithmetic number, because the mean of its divisors is an integer number (1083297895).

Almost surely, 2^2166595789 is an apocalyptic number.

It is an amenable number.

2166595789 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166595789 is an equidigital number, since it uses as much as digits as its factorization.

2166595789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8164800, while the sum is 58.

The square root of 2166595789 is about 46546.7054580665. The cubic root of 2166595789 is about 1293.9752359639.

The spelling of 2166595789 in words is "two billion, one hundred sixty-six million, five hundred ninety-five thousand, seven hundred eighty-nine".