2166563 has 8 divisors (see below), whose sum is σ = 2536800. Its totient is φ = 1811520.

The previous prime is 2166557. The next prime is 2166581. The reversal of 2166563 is 3656612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2166563 - 2⁴ = 2166547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2166523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3488 + ... + 4061.

It is an arithmetic number, because the mean of its divisors is an integer number (317100).

2^2166563 is an apocalyptic number.

2166563 is a deficient number, since it is larger than the sum of its proper divisors (370237).

2166563 is an equidigital number, since it uses as much as digits as its factorization.

2166563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7597.

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

The square root of 2166563 is about 1471.9249301510. The cubic root of 2166563 is about 129.3968708309.

The spelling of 2166563 in words is "two million, one hundred sixty-six thousand, five hundred sixty-three".