2166169981057 has 2 divisors, whose sum is σ = 2166169981058. Its totient is φ = 2166169981056.

The previous prime is 2166169980971. The next prime is 2166169981061. The reversal of 2166169981057 is 7501899616612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2074337345536 + 91832635521 = 1440256^2 + 303039^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166169981057 - 2¹¹ = 2166169979009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2166169980986 and 2166169981004.

It is not a weakly prime, because it can be changed into another prime (2166169981097) 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 as a sum of consecutive naturals, namely, 1083084990528 + 1083084990529.

It is an arithmetic number, because the mean of its divisors is an integer number (1083084990529).

Almost surely, 2^{2166169981057} is an apocalyptic number.

It is an amenable number.

2166169981057 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166169981057 is an equidigital number, since it uses as much as digits as its factorization.

2166169981057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9797760, while the sum is 61.

The spelling of 2166169981057 in words is "two trillion, one hundred sixty-six billion, one hundred sixty-nine million, nine hundred eighty-one thousand, fifty-seven".