170866651661 has 2 divisors, whose sum is σ = 170866651662. Its totient is φ = 170866651660.

The previous prime is 170866651651. The next prime is 170866651667. The reversal of 170866651661 is 166156668071.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87681132100 + 83185519561 = 296110^2 + 288419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-170866651661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170866651667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85433325830 + 85433325831.

It is an arithmetic number, because the mean of its divisors is an integer number (85433325831).

Almost surely, 2^170866651661 is an apocalyptic number.

It is an amenable number.

170866651661 is a deficient number, since it is larger than the sum of its proper divisors (1).

170866651661 is an equidigital number, since it uses as much as digits as its factorization.

170866651661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The spelling of 170866651661 in words is "one hundred seventy billion, eight hundred sixty-six million, six hundred fifty-one thousand, six hundred sixty-one".