6486566861 has 2 divisors, whose sum is σ = 6486566862. Its totient is φ = 6486566860.

The previous prime is 6486566857. The next prime is 6486566939. The reversal of 6486566861 is 1686656846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6485080900 + 1485961 = 80530^2 + 1219^2 .

It is a cyclic number.

It is not a de Polignac number, because 6486566861 - 2² = 6486566857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6486566797 and 6486566806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6486562861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3243283430 + 3243283431.

It is an arithmetic number, because the mean of its divisors is an integer number (3243283431).

Almost surely, 2^6486566861 is an apocalyptic number.

It is an amenable number.

6486566861 is a deficient number, since it is larger than the sum of its proper divisors (1).

6486566861 is an equidigital number, since it uses as much as digits as its factorization.

6486566861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9953280, while the sum is 56.

The square root of 6486566861 is about 80539.2256046704. The cubic root of 6486566861 is about 1864.9690676180.

The spelling of 6486566861 in words is "six billion, four hundred eighty-six million, five hundred sixty-six thousand, eight hundred sixty-one".