2166481843 has 4 divisors (see below), whose sum is σ = 2166577648. Its totient is φ = 2166386040.

The previous prime is 2166481817. The next prime is 2166481847. The reversal of 2166481843 is 3481846612.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2166481843 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 2166481843.

It is not an unprimeable number, because it can be changed into a prime (2166481847) 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, 6973 + ... + 66193.

It is an arithmetic number, because the mean of its divisors is an integer number (541644412).

Almost surely, 2^2166481843 is an apocalyptic number.

2166481843 is a deficient number, since it is larger than the sum of its proper divisors (95805).

2166481843 is an equidigital number, since it uses as much as digits as its factorization.

2166481843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95804.

The product of its digits is 221184, while the sum is 43.

The square root of 2166481843 is about 46545.4814455711. The cubic root of 2166481843 is about 1293.9525512392.

The spelling of 2166481843 in words is "two billion, one hundred sixty-six million, four hundred eighty-one thousand, eight hundred forty-three".