2165023923 has 4 divisors (see below), whose sum is σ = 2886698568. Its totient is φ = 1443349280.

The previous prime is 2165023921. The next prime is 2165023963. The reversal of 2165023923 is 3293205612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2165023923 - 2¹ = 2165023921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2165023921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360837318 + ... + 360837323.

It is an arithmetic number, because the mean of its divisors is an integer number (721674642).

Almost surely, 2^2165023923 is an apocalyptic number.

2165023923 is a deficient number, since it is larger than the sum of its proper divisors (721674645).

2165023923 is an equidigital number, since it uses as much as digits as its factorization.

2165023923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721674644.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 2165023923 is about 46529.8175689525. The cubic root of 2165023923 is about 1293.6622337624.

The spelling of 2165023923 in words is "two billion, one hundred sixty-five million, twenty-three thousand, nine hundred twenty-three".