2168863681 has 2 divisors, whose sum is σ = 2168863682. Its totient is φ = 2168863680.

The previous prime is 2168863663. The next prime is 2168863717. The reversal of 2168863681 is 1863688612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1763244081 + 405619600 = 41991^2 + 20140^2 .

It is a cyclic number.

It is not a de Polignac number, because 2168863681 - 2²⁷ = 2034645953 is a prime.

It is a super-2 number, since 2×2168863681² = 9407939333521739522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2168863381) 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, 1084431840 + 1084431841.

It is an arithmetic number, because the mean of its divisors is an integer number (1084431841).

Almost surely, 2^2168863681 is an apocalyptic number.

It is an amenable number.

2168863681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2168863681 is an equidigital number, since it uses as much as digits as its factorization.

2168863681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 663552, while the sum is 49.

The square root of 2168863681 is about 46571.0605526651. The cubic root of 2168863681 is about 1294.4265696126.

The spelling of 2168863681 in words is "two billion, one hundred sixty-eight million, eight hundred sixty-three thousand, six hundred eighty-one".