2106823666 has 8 divisors (see below), whose sum is σ = 3200238720. Its totient is φ = 1040077428.

The previous prime is 2106823661. The next prime is 2106823679. The reversal of 2106823666 is 6663286012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2106823661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6667006 + ... + 6667321.

It is an arithmetic number, because the mean of its divisors is an integer number (400029840).

Almost surely, 2^2106823666 is an apocalyptic number.

2106823666 is a deficient number, since it is larger than the sum of its proper divisors (1093415054).

2106823666 is a wasteful number, since it uses less digits than its factorization.

2106823666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13334408.

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 2106823666 is about 45900.1488668610. The cubic root of 2106823666 is about 1281.9646883170.

The spelling of 2106823666 in words is "two billion, one hundred six million, eight hundred twenty-three thousand, six hundred sixty-six".