171099649517 has 2 divisors, whose sum is σ = 171099649518. Its totient is φ = 171099649516.

The previous prime is 171099649489. The next prime is 171099649519. The reversal of 171099649517 is 715946990171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89058077476 + 82041572041 = 298426^2 + 286429^2 .

It is a cyclic number.

It is not a de Polignac number, because 171099649517 - 2⁸ = 171099649261 is a prime.

Together with 171099649519, 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 (171099649519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85549824758 + 85549824759.

It is an arithmetic number, because the mean of its divisors is an integer number (85549824759).

Almost surely, 2^171099649517 is an apocalyptic number.

It is an amenable number.

171099649517 is a deficient number, since it is larger than the sum of its proper divisors (1).

171099649517 is an equidigital number, since it uses as much as digits as its factorization.

171099649517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4286520, while the sum is 59.

The spelling of 171099649517 in words is "one hundred seventy-one billion, ninety-nine million, six hundred forty-nine thousand, five hundred seventeen".