171563791079 has 2 divisors, whose sum is σ = 171563791080. Its totient is φ = 171563791078.

The previous prime is 171563791043. The next prime is 171563791081. The reversal of 171563791079 is 970197365171.

It is a strong prime.

It is an emirp because it is prime and its reverse (970197365171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171563791079 - 2¹² = 171563786983 is a prime.

Together with 171563791081, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171563761079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85781895539 + 85781895540.

It is an arithmetic number, because the mean of its divisors is an integer number (85781895540).

Almost surely, 2^171563791079 is an apocalyptic number.

171563791079 is a deficient number, since it is larger than the sum of its proper divisors (1).

171563791079 is an equidigital number, since it uses as much as digits as its factorization.

171563791079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2500470, while the sum is 56.

The spelling of 171563791079 in words is "one hundred seventy-one billion, five hundred sixty-three million, seven hundred ninety-one thousand, seventy-nine".