2163666 has 8 divisors (see below), whose sum is σ = 4327344. Its totient is φ = 721220.

The previous prime is 2163653. The next prime is 2163671. The reversal of 2163666 is 6663612.

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

2163666 is an admirable number.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180300 + ... + 180311.

It is an arithmetic number, because the mean of its divisors is an integer number (540918).

2^2163666 is an apocalyptic number.

2163666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2163666 is a wasteful number, since it uses less digits than its factorization.

2163666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360616.

The product of its digits is 7776, while the sum is 30.

The square root of 2163666 is about 1470.9405154526. The cubic root of 2163666 is about 129.3391711563.

The spelling of 2163666 in words is "two million, one hundred sixty-three thousand, six hundred sixty-six".