2681657857 has 2 divisors, whose sum is σ = 2681657858. Its totient is φ = 2681657856.

The previous prime is 2681657789. The next prime is 2681657887. The reversal of 2681657857 is 7587561862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2574141696 + 107516161 = 50736^2 + 10369^2 .

It is a cyclic number.

It is not a de Polignac number, because 2681657857 - 2⁷ = 2681657729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2681657798 and 2681657807.

It is not a weakly prime, because it can be changed into another prime (2681657887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1340828928 + 1340828929.

It is an arithmetic number, because the mean of its divisors is an integer number (1340828929).

Almost surely, 2^2681657857 is an apocalyptic number.

It is an amenable number.

2681657857 is a deficient number, since it is larger than the sum of its proper divisors (1).

2681657857 is an equidigital number, since it uses as much as digits as its factorization.

2681657857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5644800, while the sum is 55.

The square root of 2681657857 is about 51784.7260975666. The cubic root of 2681657857 is about 1389.3162720894.

The spelling of 2681657857 in words is "two billion, six hundred eighty-one million, six hundred fifty-seven thousand, eight hundred fifty-seven".