171216066839 has 2 divisors, whose sum is σ = 171216066840. Its totient is φ = 171216066838.

The previous prime is 171216066821. The next prime is 171216066851. The reversal of 171216066839 is 938660612171.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171216066839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171216066809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85608033419 + 85608033420.

It is an arithmetic number, because the mean of its divisors is an integer number (85608033420).

Almost surely, 2^171216066839 is an apocalyptic number.

171216066839 is a deficient number, since it is larger than the sum of its proper divisors (1).

171216066839 is an equidigital number, since it uses as much as digits as its factorization.

171216066839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 50.

The spelling of 171216066839 in words is "one hundred seventy-one billion, two hundred sixteen million, sixty-six thousand, eight hundred thirty-nine".