2166564 has 12 divisors (see below), whose sum is σ = 5055344. Its totient is φ = 722184.

The previous prime is 2166557. The next prime is 2166581. The reversal of 2166564 is 4656612.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

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, 90262 + ... + 90285.

2^2166564 is an apocalyptic number.

It is an amenable number.

2166564 is an abundant number, since it is smaller than the sum of its proper divisors (2888780).

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

2166564 is a wasteful number, since it uses less digits than its factorization.

2166564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180554 (or 180552 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 2166564 is about 1471.9252698422. The cubic root of 2166564 is about 129.3968907391.

The spelling of 2166564 in words is "two million, one hundred sixty-six thousand, five hundred sixty-four".