171398626708249 has 2 divisors, whose sum is σ = 171398626708250. Its totient is φ = 171398626708248.

The previous prime is 171398626708181. The next prime is 171398626708277. The reversal of 171398626708249 is 942807626893171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151626419614224 + 19772207094025 = 12313668^2 + 4446595^2 .

It is a cyclic number.

It is not a de Polignac number, because 171398626708249 - 2¹¹ = 171398626706201 is a prime.

It is not a weakly prime, because it can be changed into another prime (171398626708549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85699313354124 + 85699313354125.

It is an arithmetic number, because the mean of its divisors is an integer number (85699313354125).

Almost surely, 2^{171398626708249} is an apocalyptic number.

It is an amenable number.

171398626708249 is a deficient number, since it is larger than the sum of its proper divisors (1).

171398626708249 is an equidigital number, since it uses as much as digits as its factorization.

171398626708249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 438939648, while the sum is 73.

The spelling of 171398626708249 in words is "one hundred seventy-one trillion, three hundred ninety-eight billion, six hundred twenty-six million, seven hundred eight thousand, two hundred forty-nine".