6539640171697 has 2 divisors, whose sum is σ = 6539640171698. Its totient is φ = 6539640171696.

The previous prime is 6539640171667. The next prime is 6539640171739. The reversal of 6539640171697 is 7961710469356.

6539640171697 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3375656591616 + 3163983580081 = 1837296^2 + 1778759^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6539640171697 is a prime.

It is not a weakly prime, because it can be changed into another prime (6539640171607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3269820085848 + 3269820085849.

It is an arithmetic number, because the mean of its divisors is an integer number (3269820085849).

Almost surely, 2^{6539640171697} is an apocalyptic number.

It is an amenable number.

6539640171697 is a deficient number, since it is larger than the sum of its proper divisors (1).

6539640171697 is an equidigital number, since it uses as much as digits as its factorization.

6539640171697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51438240, while the sum is 64.

The spelling of 6539640171697 in words is "six trillion, five hundred thirty-nine billion, six hundred forty million, one hundred seventy-one thousand, six hundred ninety-seven".