2166803939 has 2 divisors, whose sum is σ = 2166803940. Its totient is φ = 2166803938.

The previous prime is 2166803923. The next prime is 2166804007. The reversal of 2166803939 is 9393086612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2166803939 - 2⁴ = 2166803923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2166803893 and 2166803902.

It is not a weakly prime, because it can be changed into another prime (2166803839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083401969 + 1083401970.

It is an arithmetic number, because the mean of its divisors is an integer number (1083401970).

Almost surely, 2^2166803939 is an apocalyptic number.

2166803939 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166803939 is an equidigital number, since it uses as much as digits as its factorization.

2166803939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 2166803939 is about 46548.9413306039. The cubic root of 2166803939 is about 1294.0166730610.

The spelling of 2166803939 in words is "two billion, one hundred sixty-six million, eight hundred three thousand, nine hundred thirty-nine".