2686171681 has 2 divisors, whose sum is σ = 2686171682. Its totient is φ = 2686171680.

The previous prime is 2686171673. The next prime is 2686171739. The reversal of 2686171681 is 1861716862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2685830625 + 341056 = 51825^2 + 584^2 .

It is a cyclic number.

It is not a de Polignac number, because 2686171681 - 2³ = 2686171673 is a prime.

It is a super-2 number, since 2×2686171681² = 14431036599612731522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2686171381) 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, 1343085840 + 1343085841.

It is an arithmetic number, because the mean of its divisors is an integer number (1343085841).

Almost surely, 2^2686171681 is an apocalyptic number.

It is an amenable number.

2686171681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2686171681 is an equidigital number, since it uses as much as digits as its factorization.

2686171681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 46.

The square root of 2686171681 is about 51828.2903538212. The cubic root of 2686171681 is about 1390.0953441147.

The spelling of 2686171681 in words is "two billion, six hundred eighty-six million, one hundred seventy-one thousand, six hundred eighty-one".