2066111116565 has 4 divisors (see below), whose sum is σ = 2479333339884. Its totient is φ = 1652888893248.

The previous prime is 2066111116547. The next prime is 2066111116591. The reversal of 2066111116565 is 5656111116602.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 308155993924 + 1757955122641 = 555118^2 + 1325879^2 .

It is a cyclic number.

It is not a de Polignac number, because 2066111116565 - 2²⁴ = 2066094339349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206611111652 + ... + 206611111661.

It is an arithmetic number, because the mean of its divisors is an integer number (619833334971).

Almost surely, 2^{2066111116565} is an apocalyptic number.

It is an amenable number.

2066111116565 is a deficient number, since it is larger than the sum of its proper divisors (413222223319).

2066111116565 is an equidigital number, since it uses as much as digits as its factorization.

2066111116565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413222223318.

The product of its (nonzero) digits is 64800, while the sum is 41.

The spelling of 2066111116565 in words is "two trillion, sixty-six billion, one hundred eleven million, one hundred sixteen thousand, five hundred sixty-five".