171504865877231 has 2 divisors, whose sum is σ = 171504865877232. Its totient is φ = 171504865877230.

The previous prime is 171504865877153. The next prime is 171504865877297. The reversal of 171504865877231 is 132778568405171.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 171504865877231 - 2³⁰ = 171503792135407 is a prime.

It is a super-2 number, since 2×171504865877231² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171504865877131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85752432938615 + 85752432938616.

It is an arithmetic number, because the mean of its divisors is an integer number (85752432938616).

Almost surely, 2^{171504865877231} is an apocalyptic number.

171504865877231 is a deficient number, since it is larger than the sum of its proper divisors (1).

171504865877231 is an equidigital number, since it uses as much as digits as its factorization.

171504865877231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79027200, while the sum is 65.

The spelling of 171504865877231 in words is "one hundred seventy-one trillion, five hundred four billion, eight hundred sixty-five million, eight hundred seventy-seven thousand, two hundred thirty-one".