2165563924 has 12 divisors (see below), whose sum is σ = 3791207700. Its totient is φ = 1082361728.

The previous prime is 2165563909. The next prime is 2165563949. The reversal of 2165563924 is 4293655612.

It can be written as a sum of positive squares in 2 ways, for example, as 1754772100 + 410791824 = 41890^2 + 20268^2 .

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 93319 + ... + 114190.

It is an arithmetic number, because the mean of its divisors is an integer number (315933975).

Almost surely, 2^2165563924 is an apocalyptic number.

It is an amenable number.

2165563924 is a deficient number, since it is larger than the sum of its proper divisors (1625643776).

2165563924 is a wasteful number, since it uses less digits than its factorization.

2165563924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210122 (or 210120 counting only the distinct ones).

The product of its digits is 388800, while the sum is 43.

The square root of 2165563924 is about 46535.6199485942. The cubic root of 2165563924 is about 1293.7697800456.

The spelling of 2165563924 in words is "two billion, one hundred sixty-five million, five hundred sixty-three thousand, nine hundred twenty-four".