171840648797 has 2 divisors, whose sum is σ = 171840648798. Its totient is φ = 171840648796.

The previous prime is 171840648779. The next prime is 171840648821. The reversal of 171840648797 is 797846048171.

Together with previous prime (171840648779) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164646046756 + 7194602041 = 405766^2 + 84821^2 .

It is a cyclic number.

It is not a de Polignac number, because 171840648797 - 2²⁶ = 171773539933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171840648997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85920324398 + 85920324399.

It is an arithmetic number, because the mean of its divisors is an integer number (85920324399).

Almost surely, 2^171840648797 is an apocalyptic number.

It is an amenable number.

171840648797 is a deficient number, since it is larger than the sum of its proper divisors (1).

171840648797 is an equidigital number, since it uses as much as digits as its factorization.

171840648797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18966528, while the sum is 62.

The spelling of 171840648797 in words is "one hundred seventy-one billion, eight hundred forty million, six hundred forty-eight thousand, seven hundred ninety-seven".