6813807761 has 2 divisors, whose sum is σ = 6813807762. Its totient is φ = 6813807760.

The previous prime is 6813807691. The next prime is 6813807841. The reversal of 6813807761 is 1677083186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4521217600 + 2292590161 = 67240^2 + 47881^2 .

It is a cyclic number.

It is not a de Polignac number, because 6813807761 - 2²² = 6809613457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6813807061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3406903880 + 3406903881.

It is an arithmetic number, because the mean of its divisors is an integer number (3406903881).

Almost surely, 2^6813807761 is an apocalyptic number.

It is an amenable number.

6813807761 is a deficient number, since it is larger than the sum of its proper divisors (1).

6813807761 is an equidigital number, since it uses as much as digits as its factorization.

6813807761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 6813807761 is about 82545.7919036458. The cubic root of 6813807761 is about 1895.8179263736.

The spelling of 6813807761 in words is "six billion, eight hundred thirteen million, eight hundred seven thousand, seven hundred sixty-one".