173909843447849 has 2 divisors, whose sum is σ = 173909843447850. Its totient is φ = 173909843447848.

The previous prime is 173909843447783. The next prime is 173909843447881. The reversal of 173909843447849 is 948744348909371.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170285796409600 + 3624047038249 = 13049360^2 + 1903693^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-173909843447849 is a prime.

It is not a weakly prime, because it can be changed into another prime (173909843440849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86954921723924 + 86954921723925.

It is an arithmetic number, because the mean of its divisors is an integer number (86954921723925).

Almost surely, 2^{173909843447849} is an apocalyptic number.

It is an amenable number.

173909843447849 is a deficient number, since it is larger than the sum of its proper divisors (1).

173909843447849 is an equidigital number, since it uses as much as digits as its factorization.

173909843447849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5267275776, while the sum is 80.

The spelling of 173909843447849 in words is "one hundred seventy-three trillion, nine hundred nine billion, eight hundred forty-three million, four hundred forty-seven thousand, eight hundred forty-nine".