2165564 has 6 divisors (see below), whose sum is σ = 3789744. Its totient is φ = 1082780.

The previous prime is 2165557. The next prime is 2165591. The reversal of 2165564 is 4655612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 270692 + ... + 270699.

It is an arithmetic number, because the mean of its divisors is an integer number (631624).

2^2165564 is an apocalyptic number.

It is an amenable number.

2165564 is a deficient number, since it is larger than the sum of its proper divisors (1624180).

2165564 is a wasteful number, since it uses less digits than its factorization.

2165564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541395 (or 541393 counting only the distinct ones).

The product of its digits is 7200, while the sum is 29.

The square root of 2165564 is about 1471.5855394777. The cubic root of 2165564 is about 129.3769795180.

The spelling of 2165564 in words is "two million, one hundred sixty-five thousand, five hundred sixty-four".