2165643113 has 4 divisors (see below), whose sum is σ = 2173634688. Its totient is φ = 2157651540.

The previous prime is 2165643101. The next prime is 2165643127. The reversal of 2165643113 is 3113465612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2165643113 - 2¹² = 2165639017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2165643113.

It is not an unprimeable number, because it can be changed into a prime (2165643133) 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, 3995381 + ... + 3995922.

It is an arithmetic number, because the mean of its divisors is an integer number (543408672).

Almost surely, 2^2165643113 is an apocalyptic number.

It is an amenable number.

2165643113 is a deficient number, since it is larger than the sum of its proper divisors (7991575).

2165643113 is an equidigital number, since it uses as much as digits as its factorization.

2165643113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7991574.

The product of its digits is 12960, while the sum is 32.

The square root of 2165643113 is about 46536.4707836768. The cubic root of 2165643113 is about 1293.7855497773.

The spelling of 2165643113 in words is "two billion, one hundred sixty-five million, six hundred forty-three thousand, one hundred thirteen".