2166511227 has 4 divisors (see below), whose sum is σ = 2888681640. Its totient is φ = 1444340816.

The previous prime is 2166511189. The next prime is 2166511261. The reversal of 2166511227 is 7221156612.

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 2166511227 - 2¹⁶ = 2166445691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2166515227) 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, 361085202 + ... + 361085207.

It is an arithmetic number, because the mean of its divisors is an integer number (722170410).

Almost surely, 2^2166511227 is an apocalyptic number.

2166511227 is a deficient number, since it is larger than the sum of its proper divisors (722170413).

2166511227 is an equidigital number, since it uses as much as digits as its factorization.

2166511227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722170412.

The product of its digits is 10080, while the sum is 33.

The square root of 2166511227 is about 46545.7970927559. The cubic root of 2166511227 is about 1293.9584011736.

Adding to 2166511227 its reverse (7221156612), we get a palindrome (9387667839).

The spelling of 2166511227 in words is "two billion, one hundred sixty-six million, five hundred eleven thousand, two hundred twenty-seven".