166021564232383 has 2 divisors, whose sum is σ = 166021564232384. Its totient is φ = 166021564232382.

The previous prime is 166021564232351. The next prime is 166021564232417. The reversal of 166021564232383 is 383232465120661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166021564232383 - 2⁵ = 166021564232351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166021564232383.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166021564232333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83010782116191 + 83010782116192.

It is an arithmetic number, because the mean of its divisors is an integer number (83010782116192).

Almost surely, 2^{166021564232383} is an apocalyptic number.

166021564232383 is a deficient number, since it is larger than the sum of its proper divisors (1).

166021564232383 is an equidigital number, since it uses as much as digits as its factorization.

166021564232383 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7464960, while the sum is 52.

The spelling of 166021564232383 in words is "one hundred sixty-six trillion, twenty-one billion, five hundred sixty-four million, two hundred thirty-two thousand, three hundred eighty-three".