2108666849 has 4 divisors (see below), whose sum is σ = 2143235220. Its totient is φ = 2074098480.

The previous prime is 2108666743. The next prime is 2108666863. The reversal of 2108666849 is 9486668012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66259600 + 2042407249 = 8140^2 + 45193^2 .

It is a cyclic number.

It is not a de Polignac number, because 2108666849 - 2¹² = 2108662753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2108666797 and 2108666806.

It is not an unprimeable number, because it can be changed into a prime (2108663849) 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, 17284094 + ... + 17284215.

It is an arithmetic number, because the mean of its divisors is an integer number (535808805).

Almost surely, 2^2108666849 is an apocalyptic number.

It is an amenable number.

2108666849 is a deficient number, since it is larger than the sum of its proper divisors (34568371).

2108666849 is an equidigital number, since it uses as much as digits as its factorization.

2108666849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34568370.

The product of its (nonzero) digits is 995328, while the sum is 50.

The square root of 2108666849 is about 45920.2226584323. Note that the first 3 decimals coincide. The cubic root of 2108666849 is about 1282.3384273604.

The spelling of 2108666849 in words is "two billion, one hundred eight million, six hundred sixty-six thousand, eight hundred forty-nine".