320240165256161 has 2 divisors, whose sum is σ = 320240165256162. Its totient is φ = 320240165256160.

The previous prime is 320240165256131. The next prime is 320240165256199. The reversal of 320240165256161 is 161652561042023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 320184678627025 + 55486629136 = 17893705^2 + 235556^2 .

It is a cyclic number.

It is not a de Polignac number, because 320240165256161 - 2¹⁰ = 320240165255137 is a prime.

It is not a weakly prime, because it can be changed into another prime (320240165256101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160120082628080 + 160120082628081.

It is an arithmetic number, because the mean of its divisors is an integer number (160120082628081).

Almost surely, 2^{320240165256161} is an apocalyptic number.

It is an amenable number.

320240165256161 is a deficient number, since it is larger than the sum of its proper divisors (1).

320240165256161 is an equidigital number, since it uses as much as digits as its factorization.

320240165256161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 320240165256161 in words is "three hundred twenty trillion, two hundred forty billion, one hundred sixty-five million, two hundred fifty-six thousand, one hundred sixty-one".