2166798797 has 2 divisors, whose sum is σ = 2166798798. Its totient is φ = 2166798796.

The previous prime is 2166798749. The next prime is 2166798833. The reversal of 2166798797 is 7978976612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1676574916 + 490223881 = 40946^2 + 22141^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166798797 - 2¹² = 2166794701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166798727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083399398 + 1083399399.

It is an arithmetic number, because the mean of its divisors is an integer number (1083399399).

Almost surely, 2^2166798797 is an apocalyptic number.

It is an amenable number.

2166798797 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166798797 is an equidigital number, since it uses as much as digits as its factorization.

2166798797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16003008, while the sum is 62.

The square root of 2166798797 is about 46548.8860983805. The cubic root of 2166798797 is about 1294.0156494583.

The spelling of 2166798797 in words is "two billion, one hundred sixty-six million, seven hundred ninety-eight thousand, seven hundred ninety-seven".