171565743313 has 2 divisors, whose sum is σ = 171565743314. Its totient is φ = 171565743312.

The previous prime is 171565743311. The next prime is 171565743329. The reversal of 171565743313 is 313347565171.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119047771089 + 52517972224 = 345033^2 + 229168^2 .

It is an emirp because it is prime and its reverse (313347565171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171565743313 - 2¹ = 171565743311 is a prime.

Together with 171565743311, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (171565743311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85782871656 + 85782871657.

It is an arithmetic number, because the mean of its divisors is an integer number (85782871657).

Almost surely, 2^171565743313 is an apocalyptic number.

It is an amenable number.

171565743313 is a deficient number, since it is larger than the sum of its proper divisors (1).

171565743313 is an equidigital number, since it uses as much as digits as its factorization.

171565743313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 793800, while the sum is 46.

The spelling of 171565743313 in words is "one hundred seventy-one billion, five hundred sixty-five million, seven hundred forty-three thousand, three hundred thirteen".