2166581113 has 4 divisors (see below), whose sum is σ = 2174819328. Its totient is φ = 2158342900.

The previous prime is 2166581107. The next prime is 2166581129. The reversal of 2166581113 is 3111856612.

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 2166581113 - 2¹³ = 2166572921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166581143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4118713 + ... + 4119238.

It is an arithmetic number, because the mean of its divisors is an integer number (543704832).

Almost surely, 2^2166581113 is an apocalyptic number.

It is an amenable number.

2166581113 is a deficient number, since it is larger than the sum of its proper divisors (8238215).

2166581113 is an equidigital number, since it uses as much as digits as its factorization.

2166581113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8238214.

The product of its digits is 8640, while the sum is 34.

The square root of 2166581113 is about 46546.5478096926. The cubic root of 2166581113 is about 1293.9723142647.

The spelling of 2166581113 in words is "two billion, one hundred sixty-six million, five hundred eighty-one thousand, one hundred thirteen".