166021564232971 has 2 divisors, whose sum is σ = 166021564232972. Its totient is φ = 166021564232970.

The previous prime is 166021564232959. The next prime is 166021564232983. The reversal of 166021564232971 is 179232465120661.

It is a balanced prime because it is at equal distance from previous prime (166021564232959) and next prime (166021564232983).

It is a cyclic number.

It is not a de Polignac number, because 166021564232971 - 2¹¹ = 166021564230923 is a prime.

It is not a weakly prime, because it can be changed into another prime (166021564292971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83010782116485 + 83010782116486.

It is an arithmetic number, because the mean of its divisors is an integer number (83010782116486).

Almost surely, 2^{166021564232971} is an apocalyptic number.

166021564232971 is a deficient number, since it is larger than the sum of its proper divisors (1).

166021564232971 is an equidigital number, since it uses as much as digits as its factorization.

166021564232971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 166021564232971 in words is "one hundred sixty-six trillion, twenty-one billion, five hundred sixty-four million, two hundred thirty-two thousand, nine hundred seventy-one".