2165663 has 2 divisors, whose sum is σ = 2165664. Its totient is φ = 2165662.

The previous prime is 2165659. The next prime is 2165671. The reversal of 2165663 is 3665612.

2165663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2165663 - 2² = 2165659 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2165063) 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, 1082831 + 1082832.

It is an arithmetic number, because the mean of its divisors is an integer number (1082832).

2^2165663 is an apocalyptic number.

2165663 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165663 is an equidigital number, since it uses as much as digits as its factorization.

2165663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 29.

The square root of 2165663 is about 1471.6191762817. The cubic root of 2165663 is about 129.3789510023.

The spelling of 2165663 in words is "two million, one hundred sixty-five thousand, six hundred sixty-three".