166021027332169 has 2 divisors, whose sum is σ = 166021027332170. Its totient is φ = 166021027332168.

The previous prime is 166021027332101. The next prime is 166021027332197. The reversal of 166021027332169 is 961233720120661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164522821956025 + 1498205376144 = 12826645^2 + 1224012^2 .

It is a cyclic number.

It is not a de Polignac number, because 166021027332169 - 2²⁹ = 166020490461257 is a prime.

It is a super-2 number, since 2×166021027332169² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166021027332569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83010513666084 + 83010513666085.

It is an arithmetic number, because the mean of its divisors is an integer number (83010513666085).

Almost surely, 2^{166021027332169} is an apocalyptic number.

It is an amenable number.

166021027332169 is a deficient number, since it is larger than the sum of its proper divisors (1).

166021027332169 is an equidigital number, since it uses as much as digits as its factorization.

166021027332169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 49.

The spelling of 166021027332169 in words is "one hundred sixty-six trillion, twenty-one billion, twenty-seven million, three hundred thirty-two thousand, one hundred sixty-nine".