2168105857 has 2 divisors, whose sum is σ = 2168105858. Its totient is φ = 2168105856.

The previous prime is 2168105851. The next prime is 2168105957. The reversal of 2168105857 is 7585018612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1501640001 + 666465856 = 38751^2 + 25816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2168105857 is a prime.

It is not a weakly prime, because it can be changed into another prime (2168105851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1084052928 + 1084052929.

It is an arithmetic number, because the mean of its divisors is an integer number (1084052929).

Almost surely, 2^2168105857 is an apocalyptic number.

It is an amenable number.

2168105857 is a deficient number, since it is larger than the sum of its proper divisors (1).

2168105857 is an equidigital number, since it uses as much as digits as its factorization.

2168105857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134400, while the sum is 43.

The square root of 2168105857 is about 46562.9236302876. The cubic root of 2168105857 is about 1294.2757899205.

The spelling of 2168105857 in words is "two billion, one hundred sixty-eight million, one hundred five thousand, eight hundred fifty-seven".