171785085053 has 2 divisors, whose sum is σ = 171785085054. Its totient is φ = 171785085052.

The previous prime is 171785084987. The next prime is 171785085061. The reversal of 171785085053 is 350580587171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117980571289 + 53804513764 = 343483^2 + 231958^2 .

It is a cyclic number.

It is not a de Polignac number, because 171785085053 - 2²⁰ = 171784036477 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 171785084992 and 171785085010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171785085083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85892542526 + 85892542527.

It is an arithmetic number, because the mean of its divisors is an integer number (85892542527).

Almost surely, 2^171785085053 is an apocalyptic number.

It is an amenable number.

171785085053 is a deficient number, since it is larger than the sum of its proper divisors (1).

171785085053 is an equidigital number, since it uses as much as digits as its factorization.

171785085053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176000, while the sum is 50.

The spelling of 171785085053 in words is "one hundred seventy-one billion, seven hundred eighty-five million, eighty-five thousand, fifty-three".