170161327561 has 2 divisors, whose sum is σ = 170161327562. Its totient is φ = 170161327560.

The previous prime is 170161327549. The next prime is 170161327577. The reversal of 170161327561 is 165723161071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139520925625 + 30640401936 = 373525^2 + 175044^2 .

It is a cyclic number.

It is not a de Polignac number, because 170161327561 - 2²⁹ = 169624456649 is a prime.

It is not a weakly prime, because it can be changed into another prime (170161327261) 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, 85080663780 + 85080663781.

It is an arithmetic number, because the mean of its divisors is an integer number (85080663781).

Almost surely, 2^170161327561 is an apocalyptic number.

It is an amenable number.

170161327561 is a deficient number, since it is larger than the sum of its proper divisors (1).

170161327561 is an equidigital number, since it uses as much as digits as its factorization.

170161327561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 40.

The spelling of 170161327561 in words is "one hundred seventy billion, one hundred sixty-one million, three hundred twenty-seven thousand, five hundred sixty-one".