6539640171667 has 2 divisors, whose sum is σ = 6539640171668. Its totient is φ = 6539640171666.

The previous prime is 6539640171637. The next prime is 6539640171697. The reversal of 6539640171667 is 7661710469356.

It is a balanced prime because it is at equal distance from previous prime (6539640171637) and next prime (6539640171697).

It is a cyclic number.

It is not a de Polignac number, because 6539640171667 - 2²³ = 6539631783059 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, 3269820085833 + 3269820085834.

It is an arithmetic number, because the mean of its divisors is an integer number (3269820085834).

Almost surely, 2^{6539640171667} is an apocalyptic number.

6539640171667 is a deficient number, since it is larger than the sum of its proper divisors (1).

6539640171667 is an equidigital number, since it uses as much as digits as its factorization.

6539640171667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34292160, while the sum is 61.

The spelling of 6539640171667 in words is "six trillion, five hundred thirty-nine billion, six hundred forty million, one hundred seventy-one thousand, six hundred sixty-seven".