2806640206871 has 2 divisors, whose sum is σ = 2806640206872. Its totient is φ = 2806640206870.

The previous prime is 2806640206861. The next prime is 2806640206879. The reversal of 2806640206871 is 1786020466082.

It is a happy number.

2806640206871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2806640206871 - 2³⁴ = 2789460337687 is a prime.

It is a super-2 number, since 2×2806640206871² (a number of 26 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2806640206879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1403320103435 + 1403320103436.

It is an arithmetic number, because the mean of its divisors is an integer number (1403320103436).

Almost surely, 2^{2806640206871} is an apocalyptic number.

2806640206871 is a deficient number, since it is larger than the sum of its proper divisors (1).

2806640206871 is an equidigital number, since it uses as much as digits as its factorization.

2806640206871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1548288, while the sum is 50.

The spelling of 2806640206871 in words is "two trillion, eight hundred six billion, six hundred forty million, two hundred six thousand, eight hundred seventy-one".