6809720426137 has 2 divisors, whose sum is σ = 6809720426138. Its totient is φ = 6809720426136.

The previous prime is 6809720426099. The next prime is 6809720426213. The reversal of 6809720426137 is 7316240279086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6788025787456 + 21694638681 = 2605384^2 + 147291^2 .

It is a cyclic number.

It is not a de Polignac number, because 6809720426137 - 2³⁹ = 6259964612249 is a prime.

It is not a weakly prime, because it can be changed into another prime (6809720427137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3404860213068 + 3404860213069.

It is an arithmetic number, because the mean of its divisors is an integer number (3404860213069).

Almost surely, 2^{6809720426137} is an apocalyptic number.

It is an amenable number.

6809720426137 is a deficient number, since it is larger than the sum of its proper divisors (1).

6809720426137 is an equidigital number, since it uses as much as digits as its factorization.

6809720426137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6096384, while the sum is 55.

The spelling of 6809720426137 in words is "six trillion, eight hundred nine billion, seven hundred twenty million, four hundred twenty-six thousand, one hundred thirty-seven".