2646806861 has 2 divisors, whose sum is σ = 2646806862. Its totient is φ = 2646806860.

The previous prime is 2646806843. The next prime is 2646806933. The reversal of 2646806861 is 1686086462.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1584438025 + 1062368836 = 39805^2 + 32594^2 .

It is a cyclic number.

It is not a de Polignac number, because 2646806861 - 2³⁰ = 1573065037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2646802861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1323403430 + 1323403431.

It is an arithmetic number, because the mean of its divisors is an integer number (1323403431).

Almost surely, 2^2646806861 is an apocalyptic number.

It is an amenable number.

2646806861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2646806861 is an equidigital number, since it uses as much as digits as its factorization.

2646806861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 663552, while the sum is 47.

The square root of 2646806861 is about 51447.1268488338. The cubic root of 2646806861 is about 1383.2714621898.

The spelling of 2646806861 in words is "two billion, six hundred forty-six million, eight hundred six thousand, eight hundred sixty-one".