2166323241331 has 4 divisors (see below), whose sum is σ = 2176037695552. Its totient is φ = 2156608787112.

The previous prime is 2166323241287. The next prime is 2166323241343. The reversal of 2166323241331 is 1331423236612.

It is a happy number.

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 2166323241331 - 2²¹ = 2166321144179 is a prime.

It is a super-2 number, since 2×2166323241331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166323241371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4857226776 + ... + 4857227221.

It is an arithmetic number, because the mean of its divisors is an integer number (544009423888).

Almost surely, 2^{2166323241331} is an apocalyptic number.

2166323241331 is a deficient number, since it is larger than the sum of its proper divisors (9714454221).

2166323241331 is an equidigital number, since it uses as much as digits as its factorization.

2166323241331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9714454220.

The product of its digits is 93312, while the sum is 37.

Adding to 2166323241331 its reverse (1331423236612), we get a palindrome (3497746477943).

The spelling of 2166323241331 in words is "two trillion, one hundred sixty-six billion, three hundred twenty-three million, two hundred forty-one thousand, three hundred thirty-one".