2105665013 has 4 divisors (see below), whose sum is σ = 2109515040. Its totient is φ = 2101814988.

The previous prime is 2105664941. The next prime is 2105665057. The reversal of 2105665013 is 3105665012.

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 2105665013 - 2¹⁸ = 2105402869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105665073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1924193 + ... + 1925286.

It is an arithmetic number, because the mean of its divisors is an integer number (527378760).

Almost surely, 2^2105665013 is an apocalyptic number.

It is an amenable number.

2105665013 is a deficient number, since it is larger than the sum of its proper divisors (3850027).

2105665013 is an equidigital number, since it uses as much as digits as its factorization.

2105665013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3850026.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 2105665013 is about 45887.5256796441. The cubic root of 2105665013 is about 1281.7296386495.

Subtracting 2105665013 from its reverse (3105665012), we obtain a palindrome (999999999).

The spelling of 2105665013 in words is "two billion, one hundred five million, six hundred sixty-five thousand, thirteen".